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The slide rule, also known colloquially as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and division, and also for "scientific" functions such as roots, logarithms and trigonometry, but is not normally used for addition or subtraction. Slide rules come in a diverse range of styles and generally appear in a linear or circular form with a standardized set of markings (scales) essential to performing mathematical computations. Slide rules manufactured for specialized fields such as aviation or finance typically feature additional scales that aid in calculations common to that field. William Oughtred and others developed the slide rule in the 1600s based on the emerging work on logarithms by John Napier. Before the advent of the pocket calculator, it was the most commonly used calculation tool in science and engineering. The use of slide rules continued to grow through the 1950s and 1960s even as digital computing devices were being gradually introduced; but around 1974 the electronic scientific calculator made it largely obsolete and most suppliers exited the business. A slide rule positioned so as to multiply by 2. Each number on the D (bottom) scale is double the number above it on the C (middle) scale.From Wikipedia under the
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Q. Meaning letting grown women marry 10 year old boys. Letting brothers marry sisters. Letting men have more than 1 wife. Letting gay people marry. Letting people have group marriages. 3 guys x 3 ladies Should we discredit all rules of marriage and let anything slide? Asked by You Are Dry Shaving Me - Wed Nov 12 19:41:50 2008 - - 17 Answers - 0 Comments A. You have just gave good reasons for supporting prop 8, all these things could happen if the definition of marriage is changed. Answered by swampy - Wed Nov 12 19:45:38 2008 From Yahoo Answer Search: "Slide Rules"
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About Slide Rules
The Scales of the Slide Rule
How To Make a Slide Rule (or Log-log or Semilog Graph Paper)