[Illustration: Fig I.--Leg of sawing trestle (left). Trestle seen from
above (right).]

The four legs are made of 2 by 2 inch stuff. To start with, the pieces
should be 24 inches long, to allow for the waste of cutting on the angle.

Cutting the Notches.--Make four marks 7 inches from the four corners of
the top, set your bevel to an angle of 70 degrees (or cut an angle out of a
card with the help of a protractor), and lay a leg against each mark in
turn, the end projecting an inch or so above the top. Move the leg about
till it makes the proper angle at the mark, and draw a pencil line down
each side of the leg as close up as possible. Since the legs may vary
slightly in size, use each once only for marking, and number it and the
place to which it belongs.

Lines must now be drawn along the upper and under sides of the top,
parallel to and 3/4-inch from the edge, to complete the marking out of the
notches.

Cut just inside the side marks with a fine tenon saw, and remove the wood
between the cuts back to the top and bottom marks with a broad, sharp
chisel, making the surface of the cut as true and flat as you can. Then
"offer" the leg that belongs to the cut, its end projecting an inch or so.
If it won't enter, bevel off the sides of the cut very slightly till it
will. A good driving fit is what one should aim at. While the leg is in
place, draw your pencil in the angles which it makes with the top above and
below, to obtain the lines AB, CD (Fig. 2, a).

Bevelling the Legs.-The marking out of the bevels will be much expedited if