Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)
Bullock, John · New York : Stringer & Townsend · leaf 123
and the stone may then besafely hoisted, as it is impossible for thelewis to draw out of the hole. By meansof the lewis, in a slightly altered form fromthat here shown, stones can be lowered andset under water without difficulty, the lewisbeing disengaged by means of a line attach-ed to the… … ART OF BUILDING. 119 required shape, with the least waste of material and labor,and on the plane surfaces so formed applies the moulds towhich the stone is to be worked To form a plane surface, the mason first knocks off thesuperfluous stone along one edge of the block, slH b (fig. 80), until it…
Building
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