The Slide Rule
In 1614, John Napier discovered the logarithm, which is the basic method of calculation used on the slide rule. William Oughtred used the logarithms and in 1625, invented the slide rule.
 Slide rule diagram courtesy of The HP museum. http://www.hpmuseum.org/sliderul.htm
Click on this link for
a
complete 1928 slide rule instruction booklet.
Sphere research slide rule lessons
Peter Fox has a great website that includes directions on how you can
make your own slide rule!
Make your own slide rule
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Cover for the supplemental K+E booklet, published and copyright in 1928 by K+E.
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