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Scientific American, Vol. 24, No. 21 (May 1871) (1871)

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An illustration from Scientific American, Vol. 24, No. 21 (May 1871), 1871, leaf 0
issue of the 68 6 Jefferson operations in question. The principal portion, in fact, prac- 6th inst. 89 Grant 7 tically the whole of the work, has been done by Cornish Some inconvenience has been met with during the progress 53 McClellan 8 miners, imported for the purpose, with hand drills. The of… … REMOVAL OF THE HELL GATE ROCKS-VIEW OF THE DIAMOND DRILLING MACHINE. ©1871 SCIENTIFIC AMERICAN, INC.

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