Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 25
here is first a small cavity at the heart of the tree caused l»ydecay, and flaws or cracks extend from it out toward the bark. Theheartshake is most often found in those trees which are old, ratherthan in young, vigorous saplings; it is especially to be feared inhemlock timber. Wimhhake. Fig. 5… … Fig. 5. Windsliake. crack may extend for a considerable distance up the trunk. Thisdefect is said to be caused by the expansion of the sapwood, and itis also claimed that it is caused by the wrenching to which the treeis subjected by high winds. Wiudshakes are very often found inpine timber. A…
Architecture · Building · Carpentry
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