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Square signed "J.Ramsden, 1757"

Square signed "J.Ramsden, 1757"

1757
Wooden scale ruler

Wooden scale ruler

1839-1865
Marquois scales

Marquois scales

"Digby Murray's patent radial set square", c. 1880

"Digby Murray's patent radial set square", c. 1880

1878-1882
Set of Marquois scales for drawing parallel lines

Set of Marquois scales for drawing parallel lines

1900-1930
Set squares

Set squares

Set squares

Set squares

Set squares

Set squares

Square with four scales of equal parts and ornate ends

Square with four scales of equal parts and ornate ends

Bing's "Circular Square"

Bing's "Circular Square"

Metal set square, 60 degrees

Metal set square, 60 degrees

1806-1861
Two mounted "Circular Squares"

Two mounted "Circular Squares"

Marquois scales

Marquois scales

Metal square (sides 6" x 4 3/4") engraved "Lund's coupon-divider"

Metal square (sides 6" x 4 3/4") engraved "Lund's coupon-divider"

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
Marquois scales, military pattern (a set square and two straight edges) by W.F. Stanley, London, 1876.

Marquois scales

1876
Marquois scales in boxwood (two straight edges and a set square)

Marquois scales in boxwood

1876
Three set squares, paper on wood, by T. Sopwith, for use in isometric projection

Three set squares

Brass set square, 60 and 30 degree angles, with protracting and 1/4 inch scales, made by Holtzapffel & Co., London, B4364, A50981

Brass set square

1839-1865
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

Two wooden set squares (B520; A 38448)

Two wooden set squares

Six large set squares for use with animation rostrum set up.

Six large Set Squares for use with Animation Rostrum set up.