15. Fir (d) is difficult to work with hand tool, but it glues well. It is used extensively in millwork and boatbuilding.
16. Cedar (d) has the qualities listed in the stem of the exercise. In addition, it works well, finishes smoothly, takes
paint, and glues well.
17. In cabinetmaking, the desirable characteristics of wood are different from frame construction. For example, beauty
and finishing qualities (c) would be determining factors rather than strength.
18. There are numerous variations of the mortise and tenon joint, providing ample choices for framing doors, panels,
tables, chairs and cabinets. Open, through, blind, and haunched (a) are the four variations that should be recognized in the
exercise.
19. The splined (b) miter is a method used to reinforce a plain miter joint. Figure 5c is one way of inserting a spline.
20. The framework adds strength because wood grain runs lengthwise in both length and width. Frame construction is
highly desirable because it overcomes shrinkage and swelling (c) and provides ample strength for the panel. Stool
construction is subject to shrinkage.
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