When setting out a mitre block for mouldings meeting at right angles as shown at A (Fig. 4), it is only necessary to draw a square on the top block as shown at A B C D (Fig. 1), and then the diagonal AC is the mitre line. When the mouldings meet at an obtuse or acute angle, as B or C (Fig. 4), the better plan is to set out the mitre on a piece of board, as at Fig. 2. Smooth up a board and shoot the edge, then gauge a line about 1/2 in. (say) away from the edge and set out the required angle, as shown at FH G; now bisect this angle as shown, then HK is the mitre line. A bevel should now be set to the mitre line, as shown. and then applied to the mitre block. Reference to Fig.3o will make this quite clear.
Setting Out Mitre Lines.