The bevel is then turned over and i other sides are marked and later joined horizontally across the center lines. Fig. 1.35. Completed layout for dovetail. When several dovetails are to be layed out, a convenient device for speedi up the work is the T square shown in Figure 1.36. A 1 in. x 3 in. piece of 3\ transparent plastic or celluloid has 1 in. of one end accurately cut or filed on ea side to a ratio of 1:6. This is fastened with 4 screws at a measured right angle to a squared block of hardwood 516 in. x 1 in. x 4 in. The use of this T square will be greatly facilitated if a baseline upon which to proportion the average width of the tails (or pins) is squared off on the member to be measured, midway between the first depth line and the end of the board. The parallel spacing lines are then projected across or down to this baseline, indicating the average width of the tails. If the T square is applied at this point, no further measurements will be required. The actual cutting of the tails is as simple as sawing a double tenon. For tl Mechanic who has mastered the brace and bit, it is feasible to bore the propi sed holes at the depth of the tails. Then after clamping the piece vertically in the sides of the tails can be sawed with a backsaw. The socket bottoms ca • finished off with a coping saw or chiseled across, cutting halfway through 01 Fig. 1.36. Dovetail Tsquare. . side of the stock at a time. For a perfect fit the saw kerfs must always be cut in the waste material. The dovetailed piece of drawer siding is now used as a templet for laying out the pins on the drawer's front edge. The dovetailed member is held firmly at a right angle while the tails are traced to outline the pins. The depth of the pins is equal to the thickness of the drawer side, in this case У> in. Mark and cut as for tails. When several dovetails are to be cut to the same size, the members of each set of pins or tails can be clamped together and sawed out at one time. Although the preceding instructions were based on a drawer whose carcass was jointed with through dovetails, such a joint is seldom encountered in the front of a drawer. Instead the pins and tails are camouflaged by one of the three methods shown in Figure 1.33. Halflap dovetails are cut so that the side members lock into two thirds or three fourths of the thickness of the drawer front. Except for diagonal saw cuts along the sides, the mortises in the front members must be chiseled out, after they are scribed from the tails, as in throughdovetail layout. Half pins are essential for a finished appearance, at the top and bottom. In a stopped dovetail the tails are cut only part of the way through the thickness of the side member, so that the pins are concealed in the final assembly. In this case the pins are cut first, to be used as a templet for the stopped tails.