old man emu Posted June 19, 2016 Share Posted June 19, 2016 Remember these? [ATTACH]47921._xfImport[/ATTACH] Just for the fun of it, I decided to rejuvenate my ability to use a slide rule. I have time to spare while between courtesy bus trips from the Club, so I thought I would put the time to good use. I realised that I needed an instruction book in physical form because if I had it on my iPad, the battery would soon go flat. I went to my local Council library and searched its on-line catalogue using the words "slide rule". In just a snap, I got the reply: "No Match". Imagine that! What would these blokes who designed the Apollo Mission space craft think? [ATTACH]47922._xfImport[/ATTACH] I know that all us aviators can use a navigation slide rule, but what about the great unwashed masses? How are they going to maintain these ancient skills? We need to show the younger generations how to use the digital calculators we had when a chip was something that came off the Old Block. The loss of this knowledge recalls a story by Isaac Asimov in which the world's calculating computers go on the fritz causing a major economic catastrophe because financial calculations cannot be done. The situation is saved by a backroom bod who has been doodling with pencil and paper and has taught himself basic mathematics. We must revive these skills! Failure to do so exposes our Society to the return of ignorance and barbarism. [ATTACH]47923._xfImport[/ATTACH] It's not logical, Jim. OME Link to comment Share on other sites More sharing options...
spacesailor Posted June 19, 2016 Share Posted June 19, 2016 Have you tried the newer version, the "tubular slide rule", if you could unwind the digits, it would be over a meter in length. spacesailor Link to comment Share on other sites More sharing options...
old man emu Posted June 19, 2016 Author Share Posted June 19, 2016 Not so new! Otis Carter Formby King (1876–1944) was a grocer and engineer in London who invented and produced a cylindrical slide rule with helical scales, primarily for business uses initially. The product was named Otis King's Patent Calculator, and was manufactured and sold by Carbic Ltd. in London from about 1922 to about 1972. With a log-scale decade length of 66 inches, the Otis King calculator should be about a full digit more accurate than a 6-inch pocket slide rule. But due to inaccuracies in tic-mark placement, some portions of its scales will read off by more than they should. For example, a reading of 4.630 might represent an answer of 4.632, or almost one part in 2000 error, when it should be accurate to one part in 6000 (66"/6000 = 0.011" estimated interpolation accuracy).[1] Link to comment Share on other sites More sharing options...
spacesailor Posted June 20, 2016 Share Posted June 20, 2016 Thats the one And it was brand new when I bought it in the seventy's. spacesailor Link to comment Share on other sites More sharing options...
Gnarly Gnu Posted June 21, 2016 Share Posted June 21, 2016 Thats the one And it was brand new when I bought it in the seventy's. Sure, he was born in the 1870's so you must have one of his first models. You're doing terrific for your age BTW Sorry, couldn't resist... Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now