Next take the 3 by 1 inch wood for the struts, and cut off a piece 32
inches long. Two inches from one end of it make a cross mark with the
square, and from the ends of the mark run lines towards the end at an angle
of 45 degrees. Cut along these lines, and lay one of the edges just cut up
against C, and flush with the outer edge of L1 (Fig. 5). Tack the strut on
temporarily to both legs, turn the trestle over, and draw your pencil
(which should have a sharp point) along the angles which the strut makes
with the legs. This gives you the limits of the overlaps. Detach the strut.
The marking-gauge now comes into use. Set it at 3/8 inch, and make marks on
the sides of the strut down to the limits, pressing the guide against what
will be the inner face of the board. The ends must now be divided down
along the gauge scratches to the limit mark with a tenon or panel saw, the
saw being kept on the inside of the mark, So that its cut is included in
the 3/8 inch, and a cross cut made to detach the piece and leave a
shoulder. The strut is "offered" again to the legs, and a mark is drawn
across the bottom parallel to the ends or the legs for the final saw cut.
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