Material. - Same pieces as before, with stub-mortise sawed off. Work. - To lay out and construct an end-dovetail-joint.

Wherever oblique cuts are to be made, great care is necessary in marking.

Place the pieces in the position shown in Fig. 1; the upper piece is to have the tenon, or dovetail, the lower the mortise. With try-square and sharp pencil, mark lines around three sides of each piece, at a distance from the end equal to the width of the opposite piece, as shown at a, a, Fig. 1. These pencil-marks should be very light, so as to be easily cleaned off with sand-paper or smooth-ing-plane.

The measurements of the dovetail are given in Fig. 3. Set the gauge at 3/8", and mark the lines b, b, Fig. 1. Set it at 2 3/8", and mark the lines b', b'. Set it at 7/8", and mark the line c, and press the point only of the gauge at d, d. Set the gauge at 1 7/8", and mark the line c', and the points e, e. Bring the edge of the blade of the try-square to coincide with the lines b and c on the end of the mortise-piece, and mark with the knife a line joining them. Do the same for all the oblique lines, as shown in Fig. 1.

The tenon (a, Fig. 2) is sawed out, and the sides of the mortise b also cut with the saw. The mortise is finished with the chisel, used as shown in Fig. 4. A vertical cut is made as at a, using the mallet, then one at b ; these to be repeated until one half through the piece, then cut on the opposite side. Avoid cutting into the sides of the mortise by inclining the chisel. The same caution must be observed in keeping some of the wood at c, Fig. 4, until the last, when it is carefully cut away, and the surface tested with the try-square. The sides of the mortise usually need a little paring before the tenon will fit. This done, the pieces should go together easily, but without play or open joints, and appear as in Fig. 5.

Fig. 6 shows an oblique dovetail-joint used in a gallows-brace, which is made of lighter material than the rest of the frame, let in about one half its thickness and pinned as shown in the figure. In practice the oblique marks on the brace are obtained directly from the beams, the dovetails are then cut, and the mortises marked on the beams from them.

Ex. 14.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6