T Square. Fig. 164. (See Handbook: Fig. 40.)

Material:

1 tongue,

1 head,

5 brass screws.

28" X 1 3/4" X 1/8". 10" X 2 1/4" X 3/8". 3/8" No. 3.

Maple, cherry, or any close-grained, well-seasoned wood, may be used in making this model. The pieces may be glued up of any dark wood edged with maple or white holly, but it is not necessary except that it makes a better looking job. If the gluing is well done, however, a piece of glued-up work will hold its shape better than if made of one piece.

Fig. 164. - T Square.

A. Accuracy of the model: This model requires that the utmost care should be exercised at each step, for unless the completed model is absolutely accurate, it is worthless. Straighten one edge of the tongue carefully, after which the other edge should be made perfectly parallel. The head may be of any desired shape.

The tongue should be fastened to the head of the square by means of small screws and glue. Use glue sparingly, and place both pieces in a vise, as shown in Fig. 165, applying a gentle pressure at first. Set the tongue in its exact relation with the head, placing a steel square, as indicated, to insure accuracy. Set up the vise to furnish sufficient pressure to hold the pieces firmly while putting in the first two or three screws, after which a handscrew may be put over the screws already in place, and the square removed from the vise, while the rest of the screws are being driven. Lay the square away for the glue to set, with handscrews so placed as to impart an equal pressure on all parts of the joint.

For finishing the model, two thin coats of shellac should be applied and well rubbed down.

Fig. 165. - Fastening the Tongue and the Head.