Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 185
Fig. 326. 168 MATERIALS. Sands and gravels are large components of mortars, Utons^ and concrete; and burntwith clay, of brick, tile, and pottery. BUILDING MATERIALS. The natural building materials of civilized communities are wood and stone, whichare to be worked or fashioned to the purposes to… … ^/- 11 -cn u^ Fig. 327. Fig. 328. Fig. 327 shows various sections of timber in which the rings or yearly growth arevery strongly shown, and the effect of shrinkage by black margins and distortion, accord-ing to the form of cut. The strongest timber lies about one third the radius from the pith in…
Mechanical drawing
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