Bevel Board. In working out steel square problems, use a planed board, 12" or 15" wide, and about 3' long, which we will call a bevel board.

One edge of this board should be jointed perfectly straight and square. In marking, a knife or a very hard, sharp pencil should be used, and the greatest accuracy should be continually exercised. As the workman acquires experience, he will be able to dispense almost entirely with this board, laying out his work directly upon the material.

Fig. 46. - Diagonal Scale of 100ths of an Inch.