Gunter's scale
UK /ˌɡʌntəz ˈskeɪl/US /ˌɡʌntɚz ˈskeɪl/
noun1
- A wooden rule, two feet long, on one side of which is 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 navigation and surveying may be solved mechanically, using only divides.
forms
Gunter's scales