Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 41
appliances not in such generaluse will be illustrated and described in con-nection with the matter treated in someof the other sections (see index). TIMBER. Growth of Timber Trees. Structure of Tree Trunk.—Trees whichproduce timber are known botanically asexogens, or outward growers, because thenew… … Fig. 124.—Cross Section of Stem ofTimber Tree. tapering bundles of vascular tissue formingthe duramen or heartwood, arranged inrings, each of which is considered to repre-sent a years growth, and interspersed with (c) medullary rays or transverse septa con-sisting of flat, hard plates of cellular…
Carpentry · Joinery
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