Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 482
of the steam-drill, andone now in very general use,is that shown in the accom-panying figure. The drill Fig. 10.—eclipse rock drill. proper is fastened directly to the piston, which can be inclined * In English quarries the name jumper is given to a hand drill some fourand ahalf to five and a half… … 404 STONES FOR BUILDING AND DECORATION. at any angle, thus fitting it for ordinary quarrying or for tun-nelling. It is driven either by steam or by compressed air. Adifferent adaptation of the same principle is employed in thechannelling and gadding machines used in getting out dimen-sion stone.…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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