The wonders of modern mechanism. A résumé of recent progress in mechanical, physical, and engineering science (1896)
Cochrane, Charles Henry, 1856- · Philadelphia J.B. Lippincott · leaf 271
amygdaloid rock, which is full of smallcavities. In many mines these cavities are more or lessfilled with pure metal, but here there is no copper untilthe conglomerate vein, composed of fragments of pre-existing rocks, is struck. The ore hoisted from the 262 WO^^DERS OF MODERN MECHANISM. shafts is… … EOCK-DRILLING. The timbering of mines constitutes an important partof mine-engineering. It is especially difficult in swell-ing ground, as the miners term it, that tends to bulgeinto the shafts, or in loose, watery ground, or in quick-sand. There are cases where mines have been abandonedas…
Inventions · Mechanical engineering · Machinery
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