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You know, it's too bad that like libraries where we borrow books, that we don't have exchanges where we can swap, or order junk parts when we need these kinds. Maybe I'm thinking of flea markets, but a lot of needed parts no one would think of taking to a flea market. Kind of like an maker/creator recycling center maybe?

I did have to use the instruction books that came with mine to learn some functions. But the basic rule of thumb to use when learning anything new is to start with what you know. Start with an equation like 2 X 3 = 6. It is best to use different numbers when learning, rather than 2 X 2. Point one cursor to 1 and the other to 2, then move the cursor from 1 to 3. If the cursors did not move relative to each other, the cursor that pointed to 2 should now be pointing to 6. If your circular slide rule has a dial so that the C and D scales move relative to each other, then point one "1" cursor to 2, then on the same scale that has the "1" pointing to 2, the 3 should be pointing to 6.This also shows that 6 / 3 = 2 and 6 / 2 = 3.For the other scales (functions), I look...

I did have to use the instruction books that came with mine to learn some functions. But the basic rule of thumb to use when learning anything new is to start with what you know. Start with an equation like 2 X 3 = 6. It is best to use different numbers when learning, rather than 2 X 2. Point one cursor to 1 and the other to 2, then move the cursor from 1 to 3. If the cursors did not move relative to each other, the cursor that pointed to 2 should now be pointing to 6. If your circular slide rule has a dial so that the C and D scales move relative to each other, then point one "1" cursor to 2, then on the same scale that has the "1" pointing to 2, the 3 should be pointing to 6.This also shows that 6 / 3 = 2 and 6 / 2 = 3.For the other scales (functions), I look at what lines up with 2. If 5 lines up with 2, then it is an inverse scale, and 4 will line up with 2.5. Be careful because this scale is reversed from the others. If 2 lines up with 4 and 3 lines up with 9, it is a "B" scale, which means it shows squares, and square roots. If 2 lines up with .3, it is an "L" or log10 scale.For the sine, cosine and tangent scales, I had to make a short list of sines and cosines for 30, 45, and 60 degrees.Just play! That is the best way to learn.Or you could use these sites:Eric's Slide Ruleshttp://www.sliderule.ca/manual.htmGreg's Slide Ruleshttp://sliderule.ozmanor.com/man/man-download.htmlRon Manley's Slide Rules sitehttp://www.sliderules.info/a-to-z/manuals.htmOr YouTube "how to use a slide rule"