Navigational Instrument: Gunter's scale

Navigational Instrument: Gunter's scale

24" x 1 5/8" navigational Gunter's scale made c. 1810. A Gunter's scale uses logarithmic and other scales to assist in numerical and trigonometric calculations. Instead of using a sliding scale like the later slide rule to assist in the addition or subtraction of logarithms, the user of a Gunter's Scale uses dividers to mark sums and differences. Navigational Instrument: Gunter's scale Gunter's Rule used in computation in navigation. See object file for label copy.