Slide Rules

Anyone who can't use a slide rule is a cultural illiterate,
and should not be allowed to vote.

—Robert A. Heinlein

Well, I used to know how to use a sliderule. I still can do some basic calculations on it and have a book on how to use a slipstick that I hope to get to this summer. Just to show that these "obsolete" devices can still be used, I present The International Slide Rule Group, The International Slide Rule Museum and The Slide Rule Universe!