We're going to have to rebuild civilization, aren't we? Shit. Well, good thing I know how to use a #SlideRule.

Lo encontré en una tienda de segunda mano. Resulta difícil creer que la gente usara este aparato para hacer cálculos reales y hacer volar aviones. #regladecalculo #SlideRule #computoanalogico

Rediscovered my Slide Rule given to me decades ago from Elgin High School, Moray, Scotland.
Along with an Instruction Manual.
Time to learn!
#SlideRule

When I built my first time machine, these and a set of log tables, were the only computational tools I used.

The Fowler Calculator. Manufactured in Sale England.
The Unique Dualistic Slide Rule. Also made in England.

#sliderule #math

Showing my age I know but here is my first ever ‘scientific calculator’. With no batteries to run out, the slide rule was the perfect solution to carrying out engineering and scientific calculations. #SlideRule #calculator

Mechanical Calculator Finds Derivitives - We like mechanical calculators like slide rules, but we have to admit that we had ... - https://hackaday.com/2025/01/06/mechanical-calculator-finds-derivitives/ #derivimeter #derivitive #mischacks #sliderule #calculus

The 19th Century #engineers, our forebears, overbuilt their products, because the #mathematical techniques, though already fully mature and accurate, were not as precise, due to the use of the #SlideRule. In the second half of the 20th Century, my generation of engineers did their best to exploit the powers of #computing to lengthen MTBF and to extend product lives.

In the 21st Century, though, engineering seems to have become obsessed with the use of #AI and other advanced computing technologies to predict accurately and precisely when products will fail, so as to aid the actuaries set the #warranties that expire just before the products fail.

#Engineering is a licensed profession with its own regulations and ethical codes. Unlike businessmen, we must not permit ourselves to kneel at the alter of profits.

Re-started a small societal-collapse preparedness practice: learning to use the #SlideRule. Growing my own food might be more important… but at least I’ll be able to calculate things :)

After looking for a long time, I finally found this #Sliderule, which belonged to my late father. Some of you will know that these #devices were used, before the advent of digital #Calculators, to perform #arithmetic operations such as #multiplication and #division to about three significant figures, by #scientists and #engineers.

#Mathematics #Computation (1/2)

According to the #sliderule manual, I'm supposed to multiply and divide with the C & D scales. The trouble is i am only getting the correct answers with the A & B scales. On the left, I'm multiplying 2 x 2 and getting 4.4. On the right, it's 4.

I have decided to make a small, circular #SlideRule part of my everyday carry.

I will not be taking questions at this time.

#HeyCohost I don't think I had many followers over there, but if you liked my #SlideRule posts there last year, follow me here and I'll repost them to a blog or something soon. happy to follow back too

https://cohost.org/turgon/post/176975-parts-of-a-slide-rul

Found in a thrift store. Hard to believe that people used to use this actual thing to do actual calculations to fly actual planes. #SlideRule #AnalogComputer #aviation

I collect slide rules, and my mother-in-law just gave me a nice addition to the collection -- which might be morphing into traditional mechanical calculating devices...it's a soroban, which seems to be a form of portable abacus. Very cool.