Mastodawn

Resuscitated #Seiko #Chronograph #FlightMaster #watch with new battery! Might learn to fly to use the #sliderule for fuel needs. 🛩️

#wristwatch #aviator

Ride Theory Aug 16

Today's bike ride needed a little calculation. 60 minutes at 10.9 mph, plus 5 more minutes when my bike computer app was off, equals 11.8 miles. #SlideRule #FlightComputer

Ride Theory Aug 12

Used my #SlideRule today.

Ian Neill Jul 5

Excited to learn how to use this retro calculator!

Saw this on eBay and couldn't resist a little bid. Anyway I won, and this turned up today.

Always did like logarithms...

#retro
#sliderule

Ride Theory Jun 29

Picked up an ASA E6-B flight computer circular #SlideRule at a yard sale. It's the same kind Spock uses on TOS, though his is aluminum; this one is paper. I have an aluminum one from another company, which I occasionally use to calculate my #ebike daily ride mileage when my GPS app fails. This one is more legible, and lighter weight.

Daniil Baturin May 29

In our high school math textbook, there were formulae for converting sums of trigonometric functions to products. We were tested of their knowledge. I hated them because there was no imaginable practical use for them.
One time, my late grandmother who was a chemical engineer, found an artifact of her young days in a cabinet — a slide rule.
When I came to visit her, she showed me that thing and offered to show me how it was used. "Look, it's trivial to multiply, but to add... let me show you, there's a trick for that".
Then the true purpose of the useless formulae clicked. They were there to help people make their lives simpler in the slide rule era. And then, no one thought to remove them from the textbook and it was reprinted with those out-of-context artifacts still in.

#math #trigonometry #sliderule