SLIDING RULE
Dictionary of Science, Literature and Art · 1842 · p. 42
A mathematical instrument or scale, consisting of two parts, one of which slides along the other, and each having certain sets of numbers engraved on it, so arranged that when a given number on the one scale is brought to coincide with a given number on the otiier, the product or some other function of the two numbers is obtained by inspection. The numbers may be adapted to answer various purposes; but the instrument is chiefly used in gauging, and for the mensuration of timber. [s. 1136]
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