Basic Slide Rule Instructions
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Scan day: 09 February 2014 UTC
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Description: Explains how to multiply, find cube and square roots and other operations. Includes illustrations.
To multiply two numbers on a typical slide rule, the user set the left index (start of the scale) on the C scale to line up with one factor on the D scale. (All labels refer to Pickett scales. Scale labels were not completely uniform between brands.) The user then found the second factor on the C scale and looked on the D scale for the product. By doing this, the user effectively added the logs (lengths) of the two numbers and looked up the antilog.
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| Date | Creation Date: 1998-01-31T05:00:00Z Expiry Date: 2017-01-30T05:00:00Z |