Kidder, Frank E. (Frank Eugene), 1859-1905, Nolan, Thomas, 1857-1926 · New York : W.T. Comstock · leaf 28
thewrenching of the tree during heavywind storms, but a recent English writer believes that they, and also the heart shakes, are produced by the expanding of the sapwood. Cup shakes often injure oak, hard pine, mahogany, walnut and elm, and are the chief defect in hemlock timber. Trees less than lo… … Fig. 13. 26 BUILDING CONSTRUCTION. log by gang or circular saws, which cut the log into slices, as shownin Fig. 16, and the edges are then trimmed by a circular saw, theedgings being worked up into laths or used for kindling. Boardssawn from the log in this way are called bastard-sawed. The
Building
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