Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 484
e. The centre of the middle largest extends lowest,so that the five formsomething like astepped arrangement,away from the centre.The drill, lifted, dropswith great force andrapidly creasesa chan-nel into the rock.The single gang ma-chine is operated bytwo men, the doubleby three. As it runsbackward… … Fig. 12.—Saunders Channelling Machine with Boiler Attached. ward on the track half an inch at each stroke, cutting half aninch or more every time of passing. The single machine willcut from 40 to 80 square feet of channel per day in marble orlimestone and at a cost of from 5 to 20 cents per square…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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