Stair-Building and the Steel Square / A Manual of Practical Instruction in the Art of Stair-Building and Hand-Railing, and the Manifold Uses of the Steel Square

by Fred. T. Hodgson; Morris Williams

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PART II
THE STEEL SQUARE

Introductory.

The Standard Steel Square has a blade 24 inches long and 2 inches wide, and a tongue from 14 to 18 inches long and 1½ inches wide. The blade is at right angles to the tongue.

The face of the square is shown in [Fig. 1]. It is always stamped with the manufacturer’s name and number.

The reverse is the back ([see Fig. 2]).

The longer arm is the blade; the shorter arm, the tongue.

In the center of the tongue, on the face side, will be found two parallel lines divided into spaces ([see Fig. 1]); this is the octagon scale.

The spaces will be found numbered 10, 20, 30, 40, 50, 60, and 70, when the tongue is 18 inches long.