Woodworking for beginners; a manual for amateurs . 70. fashion it is often after bother enough to have accomplishedmuch good work in some other way. The mitre is particularly unscientific for wide pieces used flat-ways (Fig. 569), as the inevitable expansion and contraction ofthe pieces is very apt to cause an open joint. If the wood is notquite dry, so that it shrinks, the joint may open permanently to-ward the inside corner, for when the wood shrinks in width the pieces will become narrower and so separate at the joint, leaving27 4iS Wood-Working for Beginners a crack, tapering from the inne
Woodworking for beginners; a manual for amateurs . 70. fashion it is often after bother enough to have accomplishedmuch good work in some other way. The mitre is particularly unscientific for wide pieces used flat-ways (Fig. 569), as the inevitable expansion and contraction ofthe pieces is very apt to cause an open joint. If the wood is notquite dry, so that it shrinks, the joint may open permanently to-ward the inside corner, for when the wood shrinks in width the pieces will become narrower and so separate at the joint, leaving27 4iS Wood-Working for Beginners a crack, tapering from the inner to the outer corner. Even if thewood is thorouglily seasoned it will expand and contract moreor less. When it expands, the joint will tend to open at theouter corner (Fig. 570). When it contracts it will tend toopen, as just shown (Fig. 571), at the inner corner. Of course there are some cases, as in making a picture frameof prepared mouldings, when mitring is the only way in whichthe frame can be put together, and there are some other cases in. Fig. 57r. Fig. 572. Fig. 573. which it is the most proper and suitable joint, but as a generalrule, for amateur work, particularly in framing where strengthis a consideration, avoid the mitre. Other and better forms foranything like a box are shown in Figs. 554, 555, 556, 557. The mitre is sometimes strengthened for box work and the likeby fitting a spline or tongue with the grain running across andnot lengthways of the joint (Fig. 572.) This, properly gluedunder pressure, makes a good joint and one much superior to theplain mitre. But, though easy to do with machinery, it is a slowand careful job to make such a joint by hand, and if a case ariseswhere you wish it done you had best take the work to a factory,where a circular saw is all that is needed. The principle of halving shown in Figs. 539 and 543, can alsobe applied to a mitred joint. Saw-kerfs are often made (Figs. 573 and 574) into which small Tools and Operations 419 strips a
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