Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 406
proclivites; but once the source of power was turned on,the drill began its poundings, eating holes 2 in. in diameter in the blockof granite, and making a honeycomb of it as easily as a schoolboy woulddemolish a sponge cake. It pounds away at the rate of 300 strokes, andprogresses forward about 12… … Fig. 181.—Burleigh Rock Drill on Movable Column. readily as a fireman can work his hose ; and its adaptation to a wide rangeof stone-getting, by drilling for blasting, and cutting large blocks for build-ing and engineering, with a saving of capital and labour, was admitted bymany members of the…
Inventions
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