Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 184
et, but without gravel, forms a quicksand—a jelly-likematerial—from which, if a spadeful be taken out, the hole closes upat once, and excavation shows but little visible sign of a depression, the space beingmade good from the entire mass. There is another material, called quicksand, which israther… … 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…
Mechanical drawing
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