Cross-Lining With Pencil And Framing-Square (). The points having been located, draw through each a line, as ab (Face A), using the framing-square and pencil.

While a line is being produced by the outside of the shorter leg of the square bc, Fig. 138, allow the longer leg ab to drop down so that its inside edge may be firmly pressed against the working-face, as indicated by the arrows d. When the progress of the lining causes the leg ab to project beyond the work so much as to be imperfectly guided by the working-face, as shown at a'b', Fig. 138, its position should be reversed as indicated by the dotted outline. This method must be observed in using any similar tool, as the try-square, bevel, etc.

Fig. 138