Gunter-s-scale definitions

A wooden rule, two feet long, on one side of which are marked scales of equal parts, of chords, sines, tangents, rhombs, etc., and on the other side scales of logarithms of these various parts, by means of which many problems in surveying and navigation may be solved, mechanically, using only dividers.
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Origin of gunter-s-scale

After its inventor, the Rev. Edmund Gunter (1581-1626), professor of astronomy at Gresham College, London.