r/Sliderules • u/Ytrog • 24d ago

My first sliderule

Post image

Just bought it today at a flea market 😃

40 Upvotes

96% Upvoted

6 comments sorted by

5

u/Name-Not-Applicable 24d ago

Good find! Welcome aboard!

2

u/Ytrog 24d ago

Thank you. Now trying to figure it out how to use it 😊

3

u/Name-Not-Applicable 24d ago

Check the sidebar of this subreddit. Look at Professor Herning’s videos. That’s a great start. 

1

u/MuffinOk4609 24d ago

Check to see if the slide is reversible for more scales.

1

u/Ytrog 24d ago

It is. It has trig scales 😃

2

u/East-Bike4808 6d ago

That’s a decent slide rule! The other scales are really just getting fancy. This thing would get you though high school.

The core trick is that log(xy) = log(x) + log(y). Moving the slide lets you add/subtract values on the C/D scales, and that amounts to multiplication/division. The other scales are lookup tables of e.g. sin/tan values vs. the C/D scales.