Fig. 31.—Position of Try-square when
Making Line.
(C.) The use of this tool in squaring an edge is shown in Fig. 29. The piece being squared should be in such a position that the try-square will be between the eye and the light; in this way, the slightest inaccuracy may be detected. In Fig. 31 is shown the position of the try-square when used to make a line by the edge of the blade. If working from the edge indicated, hold the beam against the edge with the thumb, and at the same time hold the blade down with one or two fingers, using the others to steady the square in its place upon the board. (D.) Two try-squares may be used to see if a piece of wood is “out of wind” (i sounded as in kind) by the method indicated in Fig. 30.
Two pieces of wood known as winding sticks, of exactly the same width and perfectly parallel, are often used in manual-training schools for this purpose; they are rarely used in a shop, however, as a workman generally will use two steel squares if the piece is too large to be sighted accurately without some aid of this sort.
Fig. 32.—Steel, or Framing, Square.
31. The steel, or framing, square (Fig. 32) is often used as a try-square upon large work, though its most important use is in framing, or roof construction. It is indispensable in finding the lengths and the angles of rafters, braces, etc. Its use for this purpose will be explained in “Constructive Carpentry.” The long side of the framing square is known as the “blade,” and the short side as the “tongue.”
Fig. 33.—Bevel and Steel Square.
The bevel is set at an angle of 45°.