RTFA: http://www.engcom.net/index.php?option=com_slideru…
Before electronic hand held calculators, the slide rule was widely used in Engineering, Science and Commerce for rapidly performing calculations involving multiplication and division which have to be accurate to not more than three or four decimal places.
It can also be used for such operations as involution (raising to a power) and evolution (extraction of a root) and for calculations with trigonometric functions (sine, cosine, tangent, cotangent).
In addition to those for general use there where many different types of special purpose slide rules. What they all have in common is logarithmic scales.A standard slide rule consists of the actual rule, the slide and the transparent cursor with a hair line. Various logarithmic scales are engraved on the rule and the slide. When the rule is “closed”, the pairs of scales A & B and C&D respectively, coincide.
Very neat simulation!
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