Set square, metal, by Thomas Jones, 60 degrees, in metal 3/16" thick, bevelled at base and hypotenuse, at bottom of perpendicular is a brass scale 1" long divided into tenths, J.D. Potter's card inside triangular wood case Set square 1806-1861
Two brass set squares, one an equilateral triangle with two edges divided as 90 degree protractors, the other a 30 and 120 degree isosceles triangle with 1/4 inch edge scales, B4365, A50974 Two brass set squares
Marquois scales, military pattern (a set square and two straight edges) by W.F. Stanley, London, 1876. Marquois scales 1876