Haswell, Charles Haynes, 1809- [from old catalog] · New York, Harper & brothers · leaf 325
ope which the earth would assume but for theresistance of the wall. In sandy or loose earth the angle G D H is gene-nlly30° ; in firmer earth it is 3C°; and in some instances it is45°. If the upper surface of the earth and the wall which sup.,ports it are both in one horizontal plane, then the… … MECHANICS. 321 Thickness of Walls, T^oth. Faces Vertical. Wall of Bricks.—Weight of a cubic foot, 109 lbs. avoirdupois, bank ofvegetable earth behind it, A B = .16 A D. Wall of uncut /Stone.—135 lbs. per cubic foot, bank as before, AB =.15 A D. Wall of Bricks.—Bank of clay, well rammed, A B = .17 A…
Engineering · Mechanical engineering
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