National Museum of American History
Gunter's Scale
Unknown artist
The top edge of one side of this 12-inch wooden rule has a scale of inches, divided to tenths of an inch and numbered by ones from 24 to 13, with a "1" visible at the right for the 12" mark. Underneath this scale are 10" and 9" (divided to 1/2") plotting scales with diagonal scales at each end. On the other side are unlabeled, partial scales for logarithms, logarithmic sines, logarithmic versines, logarithmic tangents, meridional lines, and equal parts. On the scale of equal parts, ten units are equivalent to 3 cm.
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