Gunter's Rule / Scale in tropical wood

Gunter's rule / scale in tropical wood with brass parts in exceptional good condition. Invented in 1623 by english mathematician and astronomer edmund gunter, the gunter scale was used to solve various mathematical problems through the use of logarithms and is essentially an early version of the slide rule. The 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. The gunter’s scale is particularly specialized for nautical use, as some of its scales make direct solution of dead reckoning problems relatively easy. Developed by edmund gunter in 1623, gunter's scales or rules continued to be made and used into the 19th century. Specs: 610 X 450 mm. The small pointer compass is locked.

Ref. : 7W64WRRG