Tuesday, August 30, 2016

Slide Rule Giggles

I've always loved slide rules. As soon as I learned in 8th grade about logarithms and how they formed the basis for a slide rule, I was hooked. Just like 2 rulers can be used to do addition and subtraction, so can 2 rulers, logarithmically scaled, be used for multiplication and division. That you have to keep your wits about you for locating the decimal is what separates the experts from the wannabes. 13 x 5.4 looks the same as 135,000 * 54. The significant figures were somewhat limited to 2-and-a-half or so, particularly as the value of the leading digit increased from 1 to 9. (The span between 1 and 2 takes up about 30% of the slide rule, while the distance between 8 and 9 is just 5%.)
Even with this, they were (and still can be) powerful calculation devices. Keep in mind that the atomic bomb was developed using just slide rules and that Apollo astronauts had slide rules in their capsule during their flights to the moon. No worries about power outages or dead batteries, they were consistent and reliable.

My wife and I both have slide rules that were passed on to us (mine from my grandfather, hers from her father) and they will never be tossed in the trash until you pry them from our cold, dead hands. They are not super fancy or collector's grade, but they are a way to still be in touch with these people, knowing that their fingers handled (and their brains engaged) the same instruments in the same way.

A recent alumni newsletter from Minnesota had a article on slide rules and it included anecdotes from various engineers who used them to get through engineering classes and even the early years of their jobs until electronic calculators came along. My favorite was this from a Hungarian emigrant:
"During his time in graduate school, [Erwin] Kelen served as a teaching assistant and decided he would have a little slide rule fun with his class.

'I was at the blackboard in front of my class, solving a problem, and I was reading the results off my slide rule. Four decimals first, then squinting, two more' he said. 'Imagine, six digit accuracy from a pocket slide rule!'

After class, all the students crowded around him, wanting to know how he could read this from a tool that basically had two decimal capability. At first, he was coy in telling them that it was a special secret that enabled him to calculate with such accuracy. Surprised, they insisted he tell them his secret.

'I 'fessed up that the last four decimals of the six were purely invention on my part and we all had a good laugh' Kelen said"
The fun of this is that the students themselves would have been limited to calculating just 2 or maybe 3 significant digits, and would have no way to prove that the last 3 (or 4) digits were wrong. I imagine having a Hungarian accent helped to give a further illusion of authority.

Here's the rest of the comments.

Previous Years

August 30, 2013 - The Week that Snowballed Away from Me

August 30, 2012 - Viscoelasticity: It's Not Just for Polymers Anymore


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"Slide Rule Giggles" is a book that combines education and entertainment, offering a refreshing and enlightening combination of learning and laughter. Its engaging narratives, wordplay, and mathematical puns capture the reader's attention, making it suitable for readers of various age groups and backgrounds. The author's creative humor in mathematical scenarios inspires curiosity about math, while the book's illustrations add visual appeal. It has significant educational value, imparting mathematical knowledge in an entertaining way, and can be a valuable teaching tool.

sanradavid said...

"Slide Rule Giggles" sounds like an intriguing and potentially creative concept. A slide rule is a mechanical analog device used for mathematical calculations, especially in engineering and scientific fields. The term "giggles" suggests a playful or lighthearted approach.

It's possible that "Slide Rule Giggles" could refer to a humorous or imaginative exploration of mathematical concepts or the history of tools like slide rules. If you have specific questions or ideas related to this concept, please provide more context, and I'll do my best to assist you further.
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Robert said...

Wow, this article about "Slide Rule Giggles" was absolutely fascinating! I never thought I would come across something so unique and interesting. The concept of using a slide rule for amusement and laughter is truly innovative.
I was completely drawn in by the author's engaging writing style and their ability to vividly describe the joy and laughter that can be derived from something as seemingly mundane as a slide rule. It's amazing how creativity can transform everyday objects into sources of entertainment.
Moreover, the author's personal anecdotes and examples really brought the whole idea to life. I could almost envision the smiles and giggles that would fill the room as people experimented with slide rules in playful ways. The way they emphasized the importance of finding joy in the simplest things was truly inspiring.

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Thank you for sharing this delightful article. It reminded me to embrace the unexpected and find joy in the most unexpected places. I'll definitely be giving "Slide Rule Giggles" a try!

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Robert said...

OMG, Slide Rule Giggles!? This is just too funny! 😂 I can't help but imagine a bunch of nerdy mathematicians giggling over slide rules! It's like a secret code for laughter in the world of math geeks.
Slide rules, though a bit ancient now, were once the rock stars of calculations before calculators took over. It's fascinating to think about how much math was done with those little rulers.
But hey, in this age of computers and smartphones, Slide Rule Giggles might just be the perfect cure for anyone's math-related stress! Whenever we find ourselves stuck in a complex equation, we should take a moment to embrace our inner nerd and let out a good old Slide Rule Giggle.
So, here's to all the mathematicians out there – let your Slide Rule Giggles be heard and may laughter always be part of your mathematical journey! 🤓✨

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