Plate 53.
Cut off at this angle so that it will come on a line with the cross piece. A hole is bored with a 1/4" bit, one inch from the lower end to take a 1/4" × 2-1/2" round-head stove bolt.
Chamfer 3/8" from the lower end.
Bore a hole 4-3/4" from the lower end with an inch bit and remove the wood to form the rear fork, in the same manner as was done for the front.
The cross piece between the front and rear support, on which the seat rests, is first made 7/8" x 5" x 13-1/8".
Measure in two inches from the upper corner and draw a line to the lower corner. Saw squarely on this line to get the proper slant. Measure from this upper left-hand corner 9-1/2" and draw a line from here to the lower right-hand corner. Saw to this line. On this last end sawed, measure in 3/4" and make a tenon, as indicated in the side view. This tenon should be 1/2" thick. The other dimensions for the tenon are given on the drawing.
On the rear support a mortise is now cut of a size to receive the tenon tightly, and to make the top edge of the cross piece and upper end of the rear support on a line.
This tenon should be cut with a 1/2" bit, boring so as to make the mortise about 13/16" deep. Remove the extra wood with a small chisel until the tenon fits snugly within the mortise.
Later, when assembling, this joint is glued and 3/4" brads are driven in from the side to pin it in place, as indicated.