ith a mould cut to the requiredshape, and afterwards works offthe stone between these draughts,by a straight edge applied atright angles to them (fig. 81).The formation of conical orspherical surfaces is much less simple, and require a know-ledge of the scientific operations of stone-cutting, a… … 402 RUDIMENTS OF TIIE Iii working soft stones, the surface is brought to a smoothface with the drag, winch is a plate of steel, indented on theedge, like the teeth of a saw, to take off the marks of thetools employed in shaping it. The harder and more coarsely grained stones are generallytooled,…
Architecture · Building
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![An illustration from Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)](https://img.insideoutlibrary.com/img/200/ia-rudimentsofartof00bull-124-62.webp)
