Fig. 154a. Joints used in construction (continued)
No. 8. Shows the lap joint used for splicing two pieces lengthwise. It needs to be nailed or bolted to prevent pulling apart.
No. 9. A middle lap joint.
No. 10. Dovetail lap or lap dovetail. This form resists pulling apart and is a combination of lap and dovetail joints.
No. 11. Shows a modification of the same, only one side being dovetailed.
Fig. 154b. Joints used in construction (continued)
No. 12. Halved joint. Both pieces are cut out to half their thickness, and a width equal to that of the other piece. The pieces may be at right angles or some other angle, as shown at No. 13.
No. 13. Halved joint at 45 degrees.