by 178 piers, each about 10 feet square. which is then dipped: in glue and a copper cover put | There were 47,461 cubic yards of rock removed by the on. This exploder is pushed a short distance | excavation, and 3,676 drill holes, from 2 to 3 inches in into the end of the rack-a-rock cartridge, as… … main shaft was sunk to a depth of 64 feet below mean low tide, and from the foot of this rack-a-rock, and is filled with No. 1 dynamite; it is headings were extended parallel with and at right furnished with a common fulminate exploder. The angles to the current; there are 24 of the former and…
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