Fig. 11.
For angles of 30 degrees and 60 degrees, square a knife line at right angles to an edge. [Fig. 12]. Measure from the edge, along this line, or from this line along the edge any given distance. Take twice this distance upon the blade of the bevel and adjust so that a right triangle is formed in which the length of the longest side shall be twice that of the shortest.
5. The Marking Gage.
—The gage is used for laying out lines along the grain of the wood. It consists of a beam, [Fig. 13], head, thumb screw, and marking point or spur. The spur should be sharpened to a knife point with a file so that it may make a fine smooth line. It should project far enough below the beam so that the beam may be rolled forward in such a way as to bring the spur into the board at a slight angle, when properly marking. It should extend not less than an eighth of an inch and in most cases three-sixteenths of an inch.
Fig. 12.
Fig. 13.
The graduations on the beam are seldom reliable. It is safer to set the gage with the rule by measuring the distance from the spur to the gage block. This is done by holding the gage bottom side up in the left hand. With the right place the end of the rule against the head. [Fig. 13]. After the screw has been tightened, apply the rule again to make sure of the correctness of the setting.
