Jan. 29, 2025

Building the Empire of the Sum with Keith Houston

Building the Empire of the Sum with Keith Houston

Keith Houston is the author of Empire of the Sum: The Rise and Reign of the Pocket Calculator. He joins Alan on this episode of AMSEcast to discuss the history of calculating. From the ancient Lebombo bone to mechanical calculators, Keith covers the...

Keith Houston is the author of Empire of the Sum: The Rise and Reign of the Pocket Calculator. He joins Alan on this episode of AMSEcast to discuss the history of calculating. From the ancient Lebombo bone to mechanical calculators, Keith covers the evolution of calculating tools. This includes modern milestones like John Napier’s logarithms, the HP-35 scientific calculator, and the TI-81’s impact on U.S. classrooms. Keith also discusses his forthcoming book, Face With Tears of Joy. In this book, he explores the history, culture, and governance of emojis.
 
 
Guest Bio
Keith Houston is the author of many books. In Empire of the Sum: The Rise and Reign of the Pocket Calculator, he explores the story behind this revolutionary tool. Keith is also the creator of the Shady Characters blog where he covers the history of punctuation and typography. He is working on a new book that dives into the history of emojis.
 
 
Show Highlights
  • (1:55) When humans started counting
  • (4:37) How the abacus and counting board advanced our ability to calculate
  • (6:28) The creation of the algorithm
  • (11:13) Why the Curta stands out in the evolution of the calculator
  • (18:00) Why the Pocketronic from Texas Instruments was so groundbreaking
  • (25:44) How the HANDY-LE fits into the story of calculating
  • (26:30) HP’s role in revolutionizing calculating with the HP-35
  • (29:05) How the TI-81 was able to be found in classrooms around the world
  • (34:15) America’s reaction to calculators in the classroom setting
  • (36:17) What’s next for Keith Houston  
 
 
Links Referenced
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Welcome to AMSEcast, coming to you from Oak Ridge, Tennessee,

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a global leader in science, technology, and innovation.

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My name is Alan Lowe, director of the American Museum

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of Science and Energy, and the K-25 History Center.

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Each episode of AMSEcast presents world-renowned authors,

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scientists, historians, policymakers, and everyone in between,

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sharing their insights on a variety of fascinating topics.

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Welcome to AMSEcast.

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We very much appreciate your joining us for

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what is sure to be a fascinating episode.

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Our guest is author Keith Houston, whose work has been featured in

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publications like The New York Times, BBC Culture and the Wall Street Journal.

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He’s the creator of the Shady Characters blog, and his books include

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Shady Characters: The Secret Life of Punctuation, Symbols, and Other

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Typographical Marks, The Book: A Cover-to-Cover Exploration of the

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Most Powerful Object of Our Time, and the work we will discuss today,

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Empire of the Sum: The Rise and Reign of the Pocket Calculator.

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Keith, thanks so much for joining us on AMSEcast.

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Not at all.

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Thank you for having me.

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I will tell you, my next work of yours I must

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read is The Book because I’m obsessed with books.

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The staff here will tell you, my poor wife

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will tell you, I’m a bit overwhelmed with them.

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And we started a nice book collection here at AMSE, I think, a good

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reference book collection that they very nicely called the Lowe Library.

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I did not ask for that [laugh] . So again, thanks so much for joining us.

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I loved Empire of the Sum.

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This really—I remember being in school and getting my first

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pocket calculator, and what a world of difference that made to me.

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But you go back—in the very beginning of this book—all

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the way back to, you know, when humans started counting.

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So, when do we have any evidence of that first happening?

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And why is it believed that even back in the midst of time,

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we learned how to count using our fingers and other digits?

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Both very good questions.

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The oldest known mathematical artifact is the femur of a baboon.

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So, a leg bone from a baboon.

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It’s about 42,000 years old, and it has a

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series of notches, kind of incised across it.

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And there are 29 of them, and it looks like they

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were inscribed or incised in four separate batches.

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And so, this is probably not decoration.

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This was intentional.

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This was being used to count something which

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numbered—or some group of things—which number 29.

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And that was found in a cave in South Africa, called the Lebombo

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bone and as I say, that is our oldest mathematical artifact.

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What I found quite interesting was that this, we would call it a tally stick.

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So, there’s a concept of using pieces of

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wood, other rods, bones, and so on, to count.

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And these were used all the way down to about the 19th century.

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There was an interesting—perhaps interesting, I imagine it’s

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slightly more scary than interesting at the time—but the Houses

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of Parliament in Britain, so where the elected members of the

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British government sit almost burned to the ground in I think

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it’s about 1834.

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So, up until that point, the Treasury—the government

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department that managed money and debt and so on—still

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used tally sticks to track debts that it was owed.

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And they were phased out in 1826, and then some janitors in

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Houses of Parliament were tasked with getting rid of them.

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So, they stoked up the boilers underneath the Houses of Parliament,

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they started burning tally sticks, and it all caught fire.

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Almost turned the whole place to the ground.

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Oh, my gosh.

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Did any tally sticks survive?

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Are there other tally sticks in the British Museum or other

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places that—they would be interesting to see—from that?

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Oh absolutely, yeah.

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It was quite a big event.

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You know, there are etchings, commemorative etchings, were

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made of the time it almost burned down because of tally sticks.

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Oh, my gosh [laugh]

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.
But yeah, they’re fascinating things.

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It’s really, I guess, at that point, they were slightly more specialized.

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The Lebombo bone was just a bone, just for counting some particular quantity.

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The tally sticks that were used, that were stored in the basement of

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the Houses of Parliament were sticks, wooden sticks that were split.

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And so, you could etch a number of notches across them, and then you could

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snap off one of those pieces, and now the person, both the debtor and the

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debtee have—or the creditor and the creditee—have got a copy of what is owed.

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And you can then trade these debts as if they’re money.

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They’re effectively paper money, in some sense.

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Almost like carbon copy.

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It sounds like that’s interesting.

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Mmm.

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Yeah, yeah.

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So, you move from that and a bit further in time, you talk

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about something I think a lot of us have seen at least in grade

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school, the abacus, and then and something related called a

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counting board, which I had not heard of before reading your book.

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So, can you tell us a bit about why those inventions were so

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fundamentally important in advancing our ability to calculate numbers?

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Another good question.

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Well, you mentioned last time, how do we know that we started to count?

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Where is the evidence for how we learn to count?

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And you mentioned we use our fingers and other anatomical—actually,

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there’s one particular group of people in Papua New Guinea who

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could count up to 33 using things like nipples and genitals as well.

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So, once they ran out of fingers, they just kept on going.

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So—

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I think we all do that, Keith.

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I think

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we all do [laugh]

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[laugh] . Indeed, indeed.

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Well, I’m sure we all have personal accounting systems.

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[laugh] . Right.

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So, I think the point is, if you’re using your hands, then you can only

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do—or other parts of your body—you’re limited to a single number at a time.

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Your body that is useful for other things, for things other

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than counting, is now tied up in recording those numbers.

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And so, an abacus—or a counting board, which is effectively an abacus,

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just on a flat surface, perhaps with some columns in it, and used

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pebbles or some other tokens to record, these are the ones, these are

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the tens, these are the hundreds, these are the thousands, and so on, so

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it just functions like an abacus—this gets the number out of your head.

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So, it has the same, I think, it has the same utility that writing has.

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Writing gets things out of your head and allows you to

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record things either temporarily or more permanently.

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And of course, calculation, as you’re working through

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some large calculation, it’s useful to have that temporary

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storage mechanism, as any computer scientist will tell you.

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That’s what registers are in a computer, just

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there to hold things that you don’t need right now.

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Yeah, makes sense.

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And you continue that kind of evolution.

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You talk about John Napier, again, someone I

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didn’t know anything about until I read your book.

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Can you tell us about Mr.

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Napier and his creation, the logarithm, why that was so fundamentally important?

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I loved learning about John Napier.

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I guess I knew of him.

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He was born in the 16th century.

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He was a Scottish—well, he was a landowner,

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sort of a member of the landed gentry.

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He was an astronomer and an alchemist, as most scientists were at that point.

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It wasn’t really a distinction between being an

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alchemist, and being just your common or garden scientist.

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He needed, as did many scientists, astronomers, astrologers, in

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fact—because again, there is little distinction between the two at that

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point—he needed a way to do fairly complicated mathematical problems

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that involved things like trigonometry, and also multiplication.

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And so, he discovered some—this innovation, this one particular equation

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that allowed you to multiply two sines together by doing a lookup.

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Effectively, someone calculated the results in one particular

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way, laid them out in a book, and so if you needed to add sinX to

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sinY, or multiply sinX to sinY, you could look it up in this book.

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And he thought this was great.

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And he thought, I wonder if I can improve on this.

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So, he did.

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So, he came with his own version of it.

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Actually, sorry, that’s a lie.

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The algorithm that existed before him was slightly more

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complicated than just adding two looked up numbers.

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He managed to simplify it to this look up

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to, you know, sinX plus sinY, or thereabouts.

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And his version was specialized to astronomy.

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It was all about angles.

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But a friend of his, a guy called Henry Briggs,

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then generalized it to just base-ten numbers.

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So what, effectively, logarithms allow you to do is they allow

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you to multiply pretty much any two numbers together, purely by

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doing a lookup in a table and then adding two numbers together.

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And this is just incredible.

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Like, multiplication is complicated, and

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it takes, you know, it takes a long time.

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It’s painful to do by hand.

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Logarithms just blew all of that away.

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It made it possible to carry out much larger,

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much more complicated equations, much more simply.

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But that wasn’t as far as it went.

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The thing that happened next, you know, this is birth

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of the modern era, I suppose, lots of things are

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happening, lots of people are talking to one another.

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So, you have Napier talking to Henry Briggs, who comes

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up with this base-ten generalization of logarithms.

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And then another guy comes along called

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Edmund Gunter and invents the Gunter scale.

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And this is like a ruler, except instead of measuring

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distances, it has a logarithmic scale on it.

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So, if you imagine a normal ruler for measuring distance,

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the distances between any two adjacent numbers is the same.

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So, the distance between one and two is the same as

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the distance between two and three, and three and four

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and so on, whether it’s centimeters or inches or yards.

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The Gunter scale, the numbers get closer and closer together.

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So, they start off quite far apart.

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One and two are quite far apart, two and three

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are a bit closer, three and four are closer still.

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And this is because they were laid out according to Napier’s logarithmic scales.

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And then someone else, another guy called William Oughtred

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came along and realized that if you’ve laid two Gunter scales

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together, you could do multiplication without the lookup tables.

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You didn’t need them at all.

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So, now you’ve got a physical device that allows you to multiply effectively

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any two numbers to as much precision as the scale and your eyesight allows.

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And this, in some ways, was the first mechanical calculator.

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Like, I did find it hard to define what is a calculator, and so

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I think for me, the simplest thing—I guess one of the simplest

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definitions I came across was, some external device not within

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the human brain, that can add, subtract, multiply, divide.

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Now, humans can add and subtract relatively easily.

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Multiplication and division is where it gets harder.

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The slide rule cracks that nut and allows us to do those things.

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So, to me, the slide rule is effectively the first mathematical calculator.

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You mentioned going to school and seeing your first pocket calculator.

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I think for me, I started doing fairly serious maths at school

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a few years after scientific calculators have come on the scene.

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So, for me, seeing a slide rule was almost as much of

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a revelation [laugh] going in the opposite direction.

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Just, I was amazed.

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It’s like a magic stick.

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Right [laugh]

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.
There’s such genius embedded in this little device.

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Yeah.

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I had that kind of same experience that my grandfather’s slide

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rule was in our desk at home, and I remember looking—it was a

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very mysterious thing, but I thought it was really almost an

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object of art in a way it looks, it just, it fascinated me.

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I frankly, never learned how to use a slide rule, but I love the look.

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So, I feel shamed into that, now, Keith.

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I need to go back and take a look at those.

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But I think truly both very useful and I think very, very beautiful devices.

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What about this calculating machine?

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You talk about the Curta.

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Why did it stand out in, kind of, your story of the evolution of the calculator?

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The Curta is a really interesting calculator, and it’s almost the

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junction between mechanical calculators and electronic calculators.

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So, what happened was, slide rulers had existed for

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a few hundred years, well, a couple of hundred years.

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And in around about the 17th century, this new interest in mathematics came

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together with a new interest in, I guess, philosophy, but also clockwork, oddly.

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This was when, especially in Europe, and especially among the rich, clocks,

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and fairly shortly after that, watches were the luxury item to have.

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So, you had a real, especially in Germany, you had a really burgeoning

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class of people who were very good at making small mechanical devices.

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So, you know, watches, clocks are the obvious examples.

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But museums are full of these trinkets that rich people

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bought that had some sort of clockwork mechanism inside them.

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The British Museum has got a stag inside it that you can wind

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up and send it rolling along the dinner table to a companion,

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and it has a little compartment in it for some wine, so when

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it reaches someone, they have to pick it up and drink the wine.

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That was typical.

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And then René Descartes, the French philosopher,

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thought of people and our minds as machines.

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There was just this general kind of—I guess it’s the birth of

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the notion of computing as some sort of mechanical operation.

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And so, all of this came together.

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And there were, I think, two or three different people in

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France, Germany, and the UK, who all roughly had an idea that

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perhaps we can carry a calculation in some mechanical way.

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Not quite at the same time, but perhaps the most important

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one was Pascal, a French philosopher and mathematician, and I

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guess, a quite significant writer on Christian themes as well.

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He managed to build something that wouldn’t have been recognized as

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a mechanical calculator for at least a good couple of hundred years.

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So, it’s about the size of a typewriter or a shoebox, and

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had a number of dials along the front, and as you turned

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the dial, it would add a number to a little accumulator.

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So, it had a set of little windows along the top, and as

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you turned these dials in the bottom, it just added up, you

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know, the accumulators accepted the number from the bottom.

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And they would carry, so you know, as you go from nine to zero on

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one of the dials, it would carry the one to the next dial along.

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The carry mechanism on his machine was too fragile.

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It didn’t work very well, but someone else did manage to perfect—this

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was another French, actually an accountant, a sort of—I think again,

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he was effectively, what an [insurance] pioneer, and he had been a

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quartermaster for the French army, for Napoleon’s army, a guy called

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Charles Xavier Thomas, and he perfected the carry mechanism, fundamentally.

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And so, he devised this mathematical calculating device called an Arithmometer.

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And this was it.

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This was the first genuinely practical, and to some

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extent, mass produced, mathematical calculator.

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It could add and subtract quite well, and it could have—so

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multiplied by, you could multiply by tens, very easily as well.

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At the heart of Thomas’ machine, the Arithmometer,

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was a component called the stepped drum.

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And it’s not easy to explain what a stepped drum is, but it’s almost worth

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it because it helps explain how the Curta works and how it is an improvement.

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So, the stepped drum was a drum, and it had around it a number of splines.

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It had nine splines, and they all start at the bottom.

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And as you move up the drum, the first one stops very

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short, then the second one stops a bit less short—or a bit

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longer—then the third one’s a bit longer still, and so on.

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And so, by the time we reach the top of the drum, by the time

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we reach spline number nine, it’s the full length of the drum.

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And what this means is, you could slide the drum forward or

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backwards in order to—so when you then crank the drum over one time,

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that tells you how many times an associated cog will be turned.

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So, if it’s slid all the way up, the associated cog moves by one

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tooth, or if you slide it all the way down, for example, then all

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nine splines engage it, and you add nine onto your accumulator.

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This was the principle behind the Arithmometer.

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Thomas’ Arithmometer had one drum per digit, and that made it quite bulky.

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The Curta had a single drum in the middle, and it had a

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number of sliders arranged around the outside, and this

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meant that it was about the size of a Coke can, let’s say.

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It was a genuinely pocketable mechanical calculator.

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It was designed by a mechanical inventor called Curt Herzstark.

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He was born, I think, in Vienna in the early part of the 20th

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century, and he was the son of a Jewish father and a Lutheran mother.

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And this was extremely bad news for him.

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He ended up being sent to Buchenwald, which is effectively the most notorious

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of all of the concentration camps that the Nazis ran in the Second World War.

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And he only survived because he was recognized by one of

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his jailers, who knew that he was mechanically very adept.

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And he was interviewed by the camp commandant, effectively, who

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said, “If you work for us, if you continue to work on this mechanical

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calculator you’ve been developing, perhaps things will turn out okay for

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you.” In the end, the war ended before anything much happened on that

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front, but by that point, he’d completed enough of his designs, and he

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had survived, that meant that he was able to put it into production.

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No European governments were interested, except for one called Liechtenstein.

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Your listeners may or may not have heard of Liechtenstein,

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but it’s a tiny, little Alpine state, and it’s a principality.

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The Prince of Liechtenstein was interested and invested in Curt’s device.

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He called it the Curta, meaning effectively ‘Curt’s Daughter.’

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And as I said, it went on to become the first really effective,

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pocketable, mechanical calculator, and ironically, pretty much the

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last of its kind because at that point, semiconductors—or not even

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semiconductors, but electronics were becoming much more prominent.

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The Second World War, of course, many different countries

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had been looking into electronics for one reason or another,

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and computing, digital computing, was then on the rise.

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So, the Curt—this marvelous mechanical device that really was

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never replicated again, they go for quite high prices at auction.

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I’d love to try one.

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I’ve played with simulations of one, but I’ve never

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seen one in the flesh—or in the metal—I’m afraid.

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When I read this in your book, I thought, this is a movie waiting to be made.

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I mean, what an amazing story that is.

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The Curta is relatively well known, and the story behind it is

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relatively well known, but only in certain circles, and so yeah,

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if you know about it, you know everything about it, and if you

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don’t, you know nothing about it, is the way that I feel about it.

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You go on from that, you talk about Texas Instruments.

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I lived in Dallas, Texas for a while, and that was a big place there, still.

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And the Pocketronic, you talk about, produced by Texas Instruments and Canon.

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Why was that such a groundbreaking calculator, the Pocketronic?

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So, I mentioned how electronics—I have the same problem that I

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imagine lots of people have, which is, when we think electronics,

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we think silicon chips, but the two things are distinct.

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So, electronic computers had come of age during the Second World

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War, really, but they were still made of fairly clunky components.

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So, if the main or the most important component

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in an electronic computer is a switch.

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Then up until the ’50s, that would have been a valve, or a vacuum tube.

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So, in the UK, they’re typically called valves;

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in the US are typically called vacuum tubes.

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And this is a light bulb with an extra set of wires in it, more or less.

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That’s simplifying it slightly, but it can act as an amplifier or as a switch.

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It harks all the way back to a discovery by Thomas Edison, who

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had something incredible in his hands and he didn’t realize it.

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I mean, he did well for himself.

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He did [laugh]

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.
—I believe, but he did not go on to invent the computer.

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So, computers had been these massive, bulky, room-filling devices,

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comprised largely of vacuum tubes, which are prone to fusing,

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sort of blowing out just like normal incandescent light bulbs.

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And then along came the transistor.

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And the transistor was a similar amplifier or switch, but made on a

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single, tiny piece of a semiconductor material like germanium or silicon.

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TI—Texas Instruments—were fortunate enough to have hired a semiconductor

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engineer called Jack Kilby, who went on to figure out that, well, if we

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can make individual electronic components out of individual pieces of

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germanium or silicon, what if we just put them all on a single piece?

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And so, he effectively invented the microchip.

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He worked out that you can put multiple

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different components on a single silicon chip.

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And this then, this shrinks—a room-filling computer down to something tiny.

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The main application at that point had been for the US military.

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So, for example, all of the Minuteman missiles, which are

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scattered across the Midwest, had Texas Instrument chips

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in them so they could be guided towards their targets.

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But once you have enough nuclear missiles, you don’t need any more

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microchips, which is a simple way of saying that TI needed a new market.

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Now, what they’d done once before with transistors is they had

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designed a transistor radio, and they found a consumer electronics

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company in the US to manufacture it, I think, was called Regency.

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And so, they’d done very well.

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They managed to sell lots more transistors because they stimulated this

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market, they stimulated the market for transistors by selling a device

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to use them, and they wanted to do the same thing with microchips.

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They needed a civilian market for microchips.

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And so, Pat Haggerty, the TI boss, and Jack Kilby had been on a plane one day,

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and the story is that they took off, they started discussing what they could do.

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By the time they landed, they had decided they were going to build a

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pocketable calculator, which would have been unthought-of at that point.

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The closest that had happened up to that point, I think, was—well, there

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were desktop calculators that use microchips, but TI were good at microchips.

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They wanted to demonstrate how good they

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were, and so they designed the microchips.

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They figured out that a display that is visible to the user, that

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lights up, a digital display would be too expensive, and so they came

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up with a very clever solid state printer instead, which meant that the

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calculator was only consuming energy as it was actually calculating.

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It didn’t have to light up the display the whole time.

401
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But they didn’t want to build it.

402
00:21:33,500 --> 00:21:36,139
They designed this thing, they you know, they designed

403
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the insides and the outsides, the user interface.

404
00:21:38,650 --> 00:21:41,219
They ended up partnering with Canon, who at that time were

405
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a—well, they still are—Japanese electronics manufacturer.

406
00:21:44,170 --> 00:21:45,699
They started out making cameras.

407
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They got into making electronics because they needed to make better lenses.

408
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They needed to measure things and engineer them better.

409
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And they were just part of this big swell of companies in Japan.

410
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I suppose it was the first big offshoring boom for this sort

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of thing that were just taking lots of business from the US.

412
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The US would typically make the very difficult stuff like microchips,

413
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and then ship them over to Japan to have them assembled into machines

414
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because labor was cheaper over there for the slightly lower tech stuff.

415
00:22:10,359 --> 00:22:14,030
Canon was their chosen partner, and so that was all great.

416
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And then TI took just a bit long to actually bring these chips into production.

417
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They had lots of problems with yield.

418
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They couldn’t make enough of these chips, and so by the time the

419
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Pocketronic is—which is what Canon called it—came on the market.

420
00:22:27,000 --> 00:22:27,969
It looked old-fashioned.

421
00:22:27,980 --> 00:22:30,610
It was only a few years old, but already looked obsolete because there

422
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were other, frankly better pocket calculators at that point already.

423
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So, it’s a real shame.

424
00:22:36,400 --> 00:22:38,770
They were very definitely the pioneers, but they did

425
00:22:38,770 --> 00:22:41,750
not build the first pocketable electronic calculator.

426
00:22:42,030 --> 00:22:46,729
And that really goes to the firm—what’s it—Busicom HANDY-LE.

427
00:22:47,320 --> 00:22:50,750
So that’s, if I recall correctly, the first one.

428
00:22:51,060 --> 00:22:51,420
It is.

429
00:22:51,450 --> 00:22:52,050
It is indeed.

430
00:22:52,060 --> 00:22:55,800
Busicom is, I think it’s a contraction of ‘business’ and ‘computer’—

431
00:22:56,030 --> 00:22:56,370
Got it.

432
00:22:57,790 --> 00:22:57,860
There you go.

433
00:22:57,860 --> 00:22:57,939
—so [unintelligible] it’s Busicom.

434
00:22:57,939 --> 00:23:00,570
And this is a fascinating story, really.

435
00:23:00,590 --> 00:23:06,329
They were a relatively small company that made electronic calculators in Japan.

436
00:23:07,010 --> 00:23:10,830
I think they’d made mechanical calculators, and moved on to electronic ones.

437
00:23:11,420 --> 00:23:14,850
And at this point, which is, I think, the early-’70s,

438
00:23:15,200 --> 00:23:19,050
some American chip manufacturers were making chips

439
00:23:19,130 --> 00:23:21,420
that were basically an entire calculator on a chip.

440
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It’s everything, apart from the display, the keyboard, and the batteries.

441
00:23:24,469 --> 00:23:28,070
So, all of the logic that was required to do the calculation, to have

442
00:23:28,070 --> 00:23:32,590
a memory function, to drive the display was embedded in a single chip.

443
00:23:32,840 --> 00:23:35,620
And so, Busicom thought, great, we are going to build

444
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a pocket calculator with one of these single chips.

445
00:23:38,120 --> 00:23:38,580
And they did.

446
00:23:38,960 --> 00:23:39,779
That was the HANDY-LE.

447
00:23:39,779 --> 00:23:43,110
It was about the size of a packet of cigarettes or thereabouts.

448
00:23:43,120 --> 00:23:44,850
It was fabulously expensive at the time.

449
00:23:45,120 --> 00:23:49,520
But, yeah, that was pretty much the earliest pocket calculator.

450
00:23:49,900 --> 00:23:53,540
But Busicom are maybe better known for,

451
00:23:53,570 --> 00:23:55,539
ironically, a less well known calculator.

452
00:23:55,880 --> 00:23:59,020
They had this idea of building a family of chips.

453
00:23:59,049 --> 00:24:02,570
So, not just here’s a calculator on a chip, but let’s think,

454
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okay, we’ll have an arithmetic chip, and we’ll have one for

455
00:24:06,280 --> 00:24:08,730
driving printers, and we’ll have one for driving visible

456
00:24:08,730 --> 00:24:11,779
displays, we’ll have one for interfacing with different machines.

457
00:24:12,020 --> 00:24:15,009
So, they thought, we can build a cash register with this, with

458
00:24:15,009 --> 00:24:18,909
this family of chips, or an ATM, or, indeed, a calculator.

459
00:24:19,130 --> 00:24:20,620
They couldn’t make the chips themselves.

460
00:24:20,620 --> 00:24:22,530
They could design all the logic circuits, but they didn’t

461
00:24:22,530 --> 00:24:24,590
have the expertise to actually manufacture the chips.

462
00:24:25,150 --> 00:24:29,530
They were put in touch with a little startup in the US called Intel—

463
00:24:29,679 --> 00:24:29,973
Oh, yes [laugh]

464
00:24:29,973 --> 00:24:31,600
.
—who were making memory chips at that time.

465
00:24:32,219 --> 00:24:36,210
And they went to Intel, they said, we’d like you to make these chips for us.

466
00:24:36,230 --> 00:24:38,959
And Intel said, we will take your business.

467
00:24:38,990 --> 00:24:41,880
Unfortunately, we do not have enough people to do this for you.

468
00:24:41,880 --> 00:24:43,430
And so, they proposed a different model.

469
00:24:43,930 --> 00:24:45,960
I think Busicom had [wanted] , I think it was

470
00:24:45,969 --> 00:24:49,010
more than ten chips in this family, this chip set.

471
00:24:49,490 --> 00:24:51,090
Intel thought we can do it with four.

472
00:24:51,540 --> 00:24:55,049
We can do it with a memory chip to store working information;

473
00:24:55,660 --> 00:24:58,659
a ROM which is a read-only memory, so it provides instructions;

474
00:24:58,920 --> 00:25:01,560
shift register, which is basically for input-output; and

475
00:25:01,580 --> 00:25:04,939
crucially, with a single chip to pull it all together.

476
00:25:04,980 --> 00:25:06,710
They called it a Central Processing Unit.

477
00:25:07,400 --> 00:25:13,910
This was the Intel 4004, basically the first widely available microcomputer CPU.

478
00:25:15,450 --> 00:25:18,990
And Intel did all of this so that Busicom could make a very boring,

479
00:25:19,000 --> 00:25:21,980
a very beige, desktop calculator with a printer built into it.

480
00:25:22,599 --> 00:25:26,470
All computing, the devices we’re talking on now, our phones, everything, really,

481
00:25:26,759 --> 00:25:30,699
in some way, owes its existence this one exceptionally boring calculator.

482
00:25:30,709 --> 00:25:32,780
And as I said, I think no one knows about this.

483
00:25:32,780 --> 00:25:36,239
The HANDY-LE is somewhat known because it’s the first pocket calculator.

484
00:25:36,520 --> 00:25:39,840
But, yeah, but Busicom, kind of, has since disappeared.

485
00:25:40,129 --> 00:25:43,030
Intel’s not looking too hot these days, but the

486
00:25:43,030 --> 00:25:44,700
legacy of all this very much still lives on.

487
00:25:44,870 --> 00:25:46,849
So, tell me, what timeframe are we talking?

488
00:25:46,850 --> 00:25:49,110
When was this happening with the HANDY-LE?

489
00:25:49,110 --> 00:25:53,260
The HANDY-LE was, if I remember the 1970s.

490
00:25:53,310 --> 00:25:54,100
1971.

491
00:25:56,179 --> 00:25:56,189
1971.

492
00:25:56,190 --> 00:26:00,360
You’re reminding me, I always have pop culture references—Matt will tell

493
00:26:00,360 --> 00:26:04,659
you that—a couple years ago, I was watching an old American detective

494
00:26:04,850 --> 00:26:09,280
series called Banacek with the great George Peppard in the lead role,

495
00:26:09,580 --> 00:26:13,940
and one of the episodes focused on the disappearance of a computer.

496
00:26:14,210 --> 00:26:17,920
And the computer took up the whole room, so the line in that was,

497
00:26:18,020 --> 00:26:20,954
“No one just walks away with a computer.” I love that [laugh]

498
00:26:21,479 --> 00:26:21,509
.
[laugh]

499
00:26:21,870 --> 00:26:24,479
.
And not to spoil it, was all done with mirrors, so the computer

500
00:26:24,480 --> 00:26:28,379
was still there, by the way, but it showed you how quickly time and

501
00:26:28,380 --> 00:26:31,720
technology had changed, for sure [laugh] . Another company that got into

502
00:26:31,720 --> 00:26:37,129
the mix that you talk about in Empire of the Sum is Hewlett Packard.

503
00:26:37,730 --> 00:26:41,920
They had a calculator called the HP-35 that was pretty revolutionary.

504
00:26:41,920 --> 00:26:43,479
Why was that so important?

505
00:26:44,060 --> 00:26:48,520
The HP-35, in some ways, doesn’t look revolutionary if

506
00:26:48,870 --> 00:26:51,810
you know that, for example, the Busicom HANDY-LE exists.

507
00:26:52,160 --> 00:26:53,629
You know it’s 1971.

508
00:26:53,830 --> 00:26:56,189
Why, it’s the first electronic pocket calculator.

509
00:26:56,630 --> 00:27:00,290
Then the HP-35 is perhaps not super exciting.

510
00:27:00,290 --> 00:27:04,350
But what it was still—it was a pocketable calculator.

511
00:27:04,630 --> 00:27:05,940
It was quite well designed.

512
00:27:06,170 --> 00:27:08,260
A fair amount of thought went into the enclosure,

513
00:27:08,270 --> 00:27:10,261
how the buttons were arranged, and so on.

514
00:27:10,261 --> 00:27:11,920
And it had 35 buttons, hence the name.

515
00:27:12,450 --> 00:27:14,169
But this was a scientific calculator.

516
00:27:14,170 --> 00:27:17,109
This was something that could do proper—or you could solve proper

517
00:27:17,109 --> 00:27:20,750
engineering-grade problems with, whereas previously, a calculator

518
00:27:20,750 --> 00:27:22,970
that could do that sort of thing would take up your desk.

519
00:27:23,110 --> 00:27:24,010
This was revolutionary.

520
00:27:24,010 --> 00:27:25,830
This was Moore’s law in action.

521
00:27:25,880 --> 00:27:28,670
The chips were tinier, the complexity was much higher.

522
00:27:29,020 --> 00:27:33,659
And I think what the HP-35 did well was it took all of the smarts that

523
00:27:33,659 --> 00:27:37,320
HP had, all of the algorithms they developed to do very complicated

524
00:27:37,870 --> 00:27:42,639
engineering problems, and figured out how to embed them on these chips.

525
00:27:42,650 --> 00:27:46,750
So, it wasn’t as clever as Busicom’s desktop calculator; it

526
00:27:46,750 --> 00:27:51,020
wasn’t as clever as Intel’s chip set; it was just a very finely

527
00:27:51,020 --> 00:27:55,040
honed application of the special purpose chip, I guess, that had

528
00:27:55,190 --> 00:27:57,889
gone—you know, we’re going to build a single chip for calculator.

529
00:27:58,080 --> 00:27:59,590
It just pushed that to its limits.

530
00:27:59,830 --> 00:28:01,720
And there was something about it, in some ways, as

531
00:28:01,720 --> 00:28:04,950
I said, the HP-35 does not initially appear super

532
00:28:04,950 --> 00:28:08,549
interesting, but something about it caught the imagination.

533
00:28:08,660 --> 00:28:12,140
Engineering students would sell their cars so they could buy HP-35s.

534
00:28:12,640 --> 00:28:15,180
NASA scientists would buy them, and then they’d be stolen.

535
00:28:15,390 --> 00:28:18,980
So, there was a short-lived fad for lockable calculator

536
00:28:18,990 --> 00:28:21,910
boxes so that you could store your calculator safely.

537
00:28:22,090 --> 00:28:25,510
There were some maths instructors in the US Army that created a course

538
00:28:25,570 --> 00:28:28,799
solely so they could give themselves an excuse to buy some HP-35s.

539
00:28:29,049 --> 00:28:29,639
This was like an iPhone.

540
00:28:29,639 --> 00:28:32,790
It had that same sort of consumer electronics,

541
00:28:32,950 --> 00:28:34,460
or made a splash in a similar way.

542
00:28:34,520 --> 00:28:38,550
And in fact, not having been shopping for consumer electronics in 1972,

543
00:28:38,550 --> 00:28:43,510
I’m not sure how true this is, but I’ve seen it said that the HP-35

544
00:28:43,580 --> 00:28:46,990
created the concept of a must-have device: what’s the next big thing?

545
00:28:47,010 --> 00:28:50,800
It was the first big thing, the first thing that took people into the shops

546
00:28:50,810 --> 00:28:53,629
to buy this one thing that they must have, whether they needed it or not.

547
00:28:54,480 --> 00:28:56,770
So, it had a huge, it had an outsized impact, I think.

548
00:28:57,059 --> 00:28:58,575
Have you used an HP-35?

549
00:28:59,130 --> 00:29:00,000
I’ve seen one.

550
00:29:01,400 --> 00:29:01,556
I’ve never used one before, unfortunately.

551
00:29:01,570 --> 00:29:04,399
I keep one trolling eBay, looking for them, but unfortunately not.

552
00:29:04,399 --> 00:29:08,590
[laugh] . Now, the next calculator I want to talk about, though I’m pretty

553
00:29:08,590 --> 00:29:14,250
sure I have used, the TI’s 81 that really was in classrooms around the world.

554
00:29:14,250 --> 00:29:16,780
Can you tell us a bit about the TI-81?

555
00:29:16,780 --> 00:29:17,330
Yes.

556
00:29:17,530 --> 00:29:21,060
TI, of course, they started making calculators, or designing

557
00:29:21,060 --> 00:29:24,309
calculators back in the late-’60s with the Pocketronic.

558
00:29:24,519 --> 00:29:26,429
They eventually realized they didn’t want to outsource

559
00:29:26,429 --> 00:29:29,530
things, so they built a, kind of, vertically integrated

560
00:29:29,590 --> 00:29:32,520
ability to make—they started off making components.

561
00:29:32,530 --> 00:29:34,780
So, they already made chips, then they started making keyboards

562
00:29:34,929 --> 00:29:37,530
and displays, and finally, they started making the enclosures

563
00:29:37,530 --> 00:29:39,820
themselves, so they could build a calculator from scratch.

564
00:29:40,190 --> 00:29:44,510
Calculators in… I think, particularly in the education

565
00:29:44,520 --> 00:29:48,860
in the US, started to get a lot of attention.

566
00:29:49,270 --> 00:29:52,950
There were a couple of teachers at Ohio State University that

567
00:29:53,110 --> 00:29:56,970
started to use calculators in one of their remedial maths classes,

568
00:29:57,580 --> 00:30:00,870
and they thought this is going to be useful for two reasons.

569
00:30:00,880 --> 00:30:03,120
One is, students who are having trouble with

570
00:30:03,400 --> 00:30:05,820
maths may be attracted by the shiny new gadgets.

571
00:30:05,820 --> 00:30:08,110
I guess, maybe the HP-35 was rubbing off a bit.

572
00:30:08,450 --> 00:30:11,260
If it’s easier for them to do simpler problems, they can concentrate

573
00:30:11,260 --> 00:30:13,689
on the more abstract concepts: ‘What are we trying to model

574
00:30:13,690 --> 00:30:16,459
here,’ not ‘How do I multiply these two large numbers together?

575
00:30:16,469 --> 00:30:17,760
How do I compute a square root?’

576
00:30:18,029 --> 00:30:20,970
If you can forget those things, you can start to think about what’s

577
00:30:20,970 --> 00:30:24,170
the underlying process or equation that we’re trying to model here?

578
00:30:24,560 --> 00:30:25,490
And it seemed to work.

579
00:30:26,010 --> 00:30:29,419
So, calculators started to gather pace.

580
00:30:30,080 --> 00:30:33,840
And TI actually looked at Casio in Japan.

581
00:30:33,840 --> 00:30:38,210
Casio had released a graphing calculator, which I suspect

582
00:30:38,210 --> 00:30:40,940
at the time, must have been as exciting as the HP-35.

583
00:30:40,940 --> 00:30:43,250
Here’s a calculator that can not only tell you

584
00:30:43,250 --> 00:30:45,910
the result of some calculation, but graph it.

585
00:30:46,450 --> 00:30:50,879
They can graph whatever you like, or 2D function you like.

586
00:30:51,240 --> 00:30:55,130
And so, TI basically cloned the Casio x-7000G.

587
00:30:56,150 --> 00:30:59,290
They used the same chip, I think, a chip called the Z80, which

588
00:30:59,290 --> 00:31:01,750
ended up being in many, many different computing devices.

589
00:31:02,050 --> 00:31:05,990
It had the same sort of functions, it was the same size, the same broad shape.

590
00:31:06,349 --> 00:31:07,790
It became very successful.

591
00:31:07,790 --> 00:31:11,441
It became the graphing calculator that anyone in the US who

592
00:31:11,441 --> 00:31:13,780
had to do any kind of advanced mathematics would get used to.

593
00:31:13,780 --> 00:31:14,950
You know, you’ve mentioned it.

594
00:31:15,190 --> 00:31:17,260
My wife is American; she talked about using one

595
00:31:17,260 --> 00:31:20,600
of the successors, I think, the TI-83 or 84.

596
00:31:20,820 --> 00:31:24,390
And so, there has been a long line of these,

597
00:31:24,400 --> 00:31:26,539
just gradually enhanced TI calculators.

598
00:31:26,710 --> 00:31:29,359
You can still buy a Texas Instruments graphing calculator

599
00:31:29,359 --> 00:31:33,170
that runs on a Z80 chip now, which just, the mind boggles.

600
00:31:33,250 --> 00:31:37,149
It’s so commoditized now and this chip was so well designed,

601
00:31:37,200 --> 00:31:39,740
incidentally, by one of the designers of the Intel 4004,

602
00:31:41,020 --> 00:31:42,910
I think it’s actually binary-compatible with the 8008.

603
00:31:43,790 --> 00:31:49,480
But yeah, so the TI-81 spawned this huge dynasty of graphing calculators.

604
00:31:49,720 --> 00:31:52,230
And then TI, I don’t know it’s a horrible thing

605
00:31:52,230 --> 00:31:53,770
to say, but I think they got a bit greedy.

606
00:31:54,000 --> 00:31:56,700
They didn’t want to lose the market that—you know, so

607
00:31:56,710 --> 00:31:59,249
basically, Casio and TI kind of shared the market for

608
00:31:59,250 --> 00:32:02,229
these graphing calculators, and TI got into lobbying.

609
00:32:02,460 --> 00:32:06,260
They started to push for Texas Instruments calculators to be the ones on the

610
00:32:06,270 --> 00:32:11,460
list of allowed devices for exams, the ones that are recommended to students.

611
00:32:11,880 --> 00:32:15,399
They made deals with textbook publishers, such that when you read through your

612
00:32:15,400 --> 00:32:18,320
maths textbook and it says, “This is how you graph this on your calculator,”

613
00:32:18,330 --> 00:32:21,600
it would be, “This is how you graph this on your TI-81 calculator.”

614
00:32:21,880 --> 00:32:23,480
So, the pictures in there are pictures of the

615
00:32:23,480 --> 00:32:26,270
TI-81, the keys in there are the keys of the TI-81.

616
00:32:26,270 --> 00:32:30,500
And it reached a head when they tried to lobby the Texas state government

617
00:32:30,530 --> 00:32:34,289
to make a particular algebra course mandatory in high school, which I’m

618
00:32:34,290 --> 00:32:37,620
sure would not have gone down well with generations of high school students.

619
00:32:37,780 --> 00:32:40,550
I think that failed, but you know, there are again, there are

620
00:32:40,600 --> 00:32:45,320
anecdotes of teachers saying that they have to provide TI-81 to

621
00:32:45,320 --> 00:32:48,530
their students, they get stolen, and they have to visit pawn shops to

622
00:32:48,530 --> 00:32:52,019
buy them back again because [laugh] the students with light fingers

623
00:32:52,020 --> 00:32:55,270
have decided to steal them, and sell them on to make a bit of money.

624
00:32:55,920 --> 00:33:00,449
So yeah, the TI-81 in itself, again, in some ways, is not super interesting.

625
00:33:00,459 --> 00:33:04,690
It was more or less a clone of existing calculator, but how sticky

626
00:33:04,690 --> 00:33:07,820
it became inside the US education system was quite striking.

627
00:33:07,930 --> 00:33:08,680
Yeah, it was everywhere.

628
00:33:09,030 --> 00:33:10,830
And Casio, though, stayed in that market.

629
00:33:10,840 --> 00:33:13,810
They continued and competed pretty well with TI, right?

630
00:33:14,060 --> 00:33:17,269
They did indeed, and especially over in Europe.

631
00:33:17,389 --> 00:33:22,540
If TI is the default in the States, from my memory, it was very much Casio.

632
00:33:22,550 --> 00:33:24,500
All of the calculators were Casio.

633
00:33:24,640 --> 00:33:25,429
I didn’t go into it.

634
00:33:25,440 --> 00:33:26,550
My publisher, W.

635
00:33:26,550 --> 00:33:26,770
W.

636
00:33:26,770 --> 00:33:27,850
Norton, is American.

637
00:33:28,130 --> 00:33:29,509
As I said, my wife is American.

638
00:33:29,509 --> 00:33:33,700
I think I end up looking at things through a kind of an

639
00:33:33,700 --> 00:33:36,730
Atlantic lens, and a sort of transatlantic lens in some sense.

640
00:33:36,740 --> 00:33:39,010
But I’m sure if I looked into it, perhaps would find Casio

641
00:33:39,620 --> 00:33:42,649
also may have done exactly the same sort of thing, I guess.

642
00:33:42,700 --> 00:33:44,540
Once you’re in a certain market, you don’t want to let go of it.

643
00:33:44,790 --> 00:33:46,280
That’s right [laugh] . That’s very true.

644
00:33:47,620 --> 00:33:47,690
Very true.

645
00:33:47,690 --> 00:33:51,070
And you do mention in your book something I ran into and remember as a kid,

646
00:33:51,410 --> 00:33:54,940
is that when calculators—and I’m sufficiently old to say this—when they really

647
00:33:54,940 --> 00:33:59,320
first started being on the scene in schools, at least in the Commonwealth

648
00:33:59,320 --> 00:34:03,240
of Kentucky, where I grew up, you weren’t allowed to use them at first.

649
00:34:03,309 --> 00:34:04,539
And then later, they became more and more

650
00:34:04,550 --> 00:34:06,550
integrated into, it’s okay to use them.

651
00:34:06,550 --> 00:34:11,019
But there was that gray area, and then it was okay, but at first it

652
00:34:11,020 --> 00:34:15,150
was like cheating, you know, if you used a calculator in math class.

653
00:34:15,150 --> 00:34:18,129
So, how did they respond here, perhaps in Europe

654
00:34:18,130 --> 00:34:21,339
as well, to that use in the classroom setting?

655
00:34:22,000 --> 00:34:23,069
That’s a really interesting one.

656
00:34:23,440 --> 00:34:27,080
I think the answer is that most teachers initially freaked out.

657
00:34:27,599 --> 00:34:30,660
Almost every new information technology

658
00:34:30,660 --> 00:34:32,830
seems to come with a built-in moral panic.

659
00:34:33,010 --> 00:34:37,290
The story of hieroglyphics, or the myth behind hieroglyphics,

660
00:34:37,290 --> 00:34:40,899
is that it was handed down to mankind by the God Thoth, and

661
00:34:41,040 --> 00:34:43,800
the mythical Egyptian king who received it turned around and

662
00:34:43,800 --> 00:34:45,999
said, well, thanks, but now we’re just going to forget stuff.

663
00:34:46,340 --> 00:34:48,280
So, [laugh] right from the very beginning, the very

664
00:34:48,380 --> 00:34:51,230
earliest information technology, it was seen as a bad thing.

665
00:34:51,489 --> 00:34:55,520
There was a kind of a debate for a long time between pen-and-paper

666
00:34:55,570 --> 00:34:58,890
mathematicians and abacists, people who used abacuses.

667
00:34:58,900 --> 00:35:02,290
Again, there was, you know, pen-and-paper was seen in some way as

668
00:35:02,290 --> 00:35:05,250
inferior to the abacus, which was the incumbent device at that point.

669
00:35:05,969 --> 00:35:09,975
Then mobile phones came along, you know, television, now AI.

670
00:35:10,250 --> 00:35:13,840
So, every significant information technology makes us

671
00:35:14,040 --> 00:35:17,489
question it and ourselves, you know, over and over again.

672
00:35:17,880 --> 00:35:19,120
And calculators were the same.

673
00:35:19,410 --> 00:35:20,360
It was the same worry.

674
00:35:20,370 --> 00:35:24,179
If you learn how to add, and subtract, and multiply, and divide using a

675
00:35:24,180 --> 00:35:28,680
calculator, what if you can’t ever do it in your head or on a piece of paper?

676
00:35:29,290 --> 00:35:30,960
And honestly, that’s correct.

677
00:35:31,050 --> 00:35:33,370
But we are now freed in the same way that

678
00:35:33,740 --> 00:35:35,620
the remedial students of OSU were freed.

679
00:35:35,870 --> 00:35:38,550
We’re now freed to think about the higher-level stuff.

680
00:35:39,030 --> 00:35:41,929
You know, we can sit back and think more

681
00:35:41,930 --> 00:35:43,930
clearly about the larger-scale problems.

682
00:35:44,160 --> 00:35:47,680
So, I think the thing happened that teachers

683
00:35:47,680 --> 00:35:50,110
were worried about, and it also doesn’t matter.

684
00:35:50,620 --> 00:35:52,120
Like, we have tools, we’re humans.

685
00:35:52,120 --> 00:35:56,040
We’re nothing, if not beings—what separates us from other animals?

686
00:35:56,270 --> 00:35:56,780
Tools.

687
00:35:56,870 --> 00:35:57,589
Writing, right?

688
00:35:57,610 --> 00:36:00,030
All of these things make us human.

689
00:36:00,119 --> 00:36:02,680
So, I don’t think we should feel too bad if we can’t

690
00:36:02,720 --> 00:36:05,050
multiply or divide large numbers in our heads anymore.

691
00:36:05,400 --> 00:36:07,360
Well, I feel much better about myself, then.

692
00:36:07,790 --> 00:36:10,220
That was always my worst field, Keith, my

693
00:36:10,220 --> 00:36:13,540
worst, so calculators were a revelation for me.

694
00:36:13,910 --> 00:36:16,200
Well, I so enjoyed Empire of the Sum.

695
00:36:16,200 --> 00:36:17,459
I enjoy all your work.

696
00:36:17,930 --> 00:36:19,310
What’s next for you?

697
00:36:19,890 --> 00:36:24,850
It is a book called Face With Tears of Joy, which is about emoji.

698
00:36:25,170 --> 00:36:28,819
So, it’s almost a sequel to my first book Shady

699
00:36:28,820 --> 00:36:31,570
Characters, which was about unusual marks of punctuation.

700
00:36:31,950 --> 00:36:38,020
I started just sort of writing about emoji in a similar way a few years ago.

701
00:36:38,070 --> 00:36:41,480
And yeah, I just felt like it was right for being turned into a book.

702
00:36:42,230 --> 00:36:45,149
Emoji went through quite a lot of turmoil in the last few years.

703
00:36:45,920 --> 00:36:48,280
I was going to say, actually, I would recommend that you buy the book.

704
00:36:48,280 --> 00:36:50,270
There’s a lot in there about governance bodies.

705
00:36:50,400 --> 00:36:52,609
If you enjoy tales of committee meetings, then this

706
00:36:52,629 --> 00:36:55,090
thing will just—this will knock your socks off.

707
00:36:55,090 --> 00:36:59,120
But there was a lot of concern about how emoji is managed.

708
00:36:59,120 --> 00:37:01,110
It’s just such an interesting subject.

709
00:37:01,110 --> 00:37:05,740
Emoji are not a language, but they display the characteristics of a language.

710
00:37:07,170 --> 00:37:09,730
They’re quite democratic in some senses, and

711
00:37:09,730 --> 00:37:12,310
also they’re not democratic at all in others.

712
00:37:12,380 --> 00:37:13,240
And they’re everywhere.

713
00:37:13,440 --> 00:37:16,109
[About] the calculators, at least with calculators, we

714
00:37:16,110 --> 00:37:18,460
somewhat—hmm, actually, no, the same thing is true of emoji.

715
00:37:18,810 --> 00:37:21,750
Some people are worried about, like, what are the morals of using a calculator?

716
00:37:21,750 --> 00:37:24,250
People worry about one of the morals of using an emoji.

717
00:37:24,940 --> 00:37:27,390
You know, there are books on etiquette that

718
00:37:27,390 --> 00:37:29,970
tell you when you can and can’t use emoji.

719
00:37:29,970 --> 00:37:32,510
So, they’re just another information technology, and they

720
00:37:32,510 --> 00:37:34,629
raise the same questions, they ask the same things of

721
00:37:34,630 --> 00:37:37,399
us as all of these other information technologies did.

722
00:37:37,990 --> 00:37:40,580
I’m giving a big smiley face to that idea.

723
00:37:40,580 --> 00:37:41,860
I’m looking forward to it, Keith.

724
00:37:42,770 --> 00:37:45,770
And again, thank you so much for joining us in AMSEcast.

725
00:37:46,100 --> 00:37:47,320
Really great conversation.

726
00:37:47,639 --> 00:37:48,150
Not at all.

727
00:37:48,160 --> 00:37:49,080
Thank you, again, for having me.

728
00:37:54,120 --> 00:37:56,810
Thank you for joining us on this episode of AMSEcast.

729
00:37:57,220 --> 00:38:01,550
For more information on this topic or any others, you can always visit us at

730
00:38:01,820 --> 00:38:08,189
AMSE.org or find, like, and follow us on Facebook, Instagram, and Twitter.

731
00:38:08,690 --> 00:38:11,010
I invite you to visit the American Museum of Science

732
00:38:11,010 --> 00:38:13,810
and Energy and the K-25 History Center in person.

733
00:38:14,130 --> 00:38:18,299
You can also shop at our online store and become a member at AMSE.org.

734
00:38:18,759 --> 00:38:22,200
Thanks to our production team with Matt Mullins, plus our supportive colleagues

735
00:38:22,200 --> 00:38:26,040
at the Department of Energy’s Office of Science, Office of Environmental

736
00:38:26,040 --> 00:38:30,029
Management, and Office of Legacy Management, as well as Oak Ridge National

737
00:38:30,030 --> 00:38:35,870
Laboratory, the Y-12 National Security Complex, NNSA, and the AMSE Foundation.

738
00:38:36,370 --> 00:38:38,109
And of course, thanks to our wonderful guests

739
00:38:38,110 --> 00:38:39,939
today, and to all of you for listening.

740
00:38:40,420 --> 00:38:43,159
I hope you’ll join us for the next episode of AMSEcast.

741
00:38:45,820 --> 00:38:48,790
If you’ve enjoyed this podcast, I would like to ask that you consider

742
00:38:48,790 --> 00:38:53,359
becoming a member of the 117 Society, the newest membership opportunity

743
00:38:53,420 --> 00:38:56,880
offered by the American Museum of Science and Energy Foundation.

744
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By joining the 117 Society, you will help us continue

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00:39:04,020 --> 00:39:06,950
You will support the expansion of our vitally important educational

747
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748
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the American Museum of Science and Energy and the K-25 History Center can

749
00:39:15,450 --> 00:39:19,560
continue to provide world-class exhibits to our community and to the world.

750
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Benefits of membership includes special access to video

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753
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To learn more, go to AMSE.org.

754
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The 117 Society is vital to the future of AMSE and the K-25 History Center.

755
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