ted by 173 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 3,070 drill holes, from 2 to 3 inches in into the end of the rack-a-i-ock cartridge, as… … mg. 8.~INSERTING EXPLODERS IN CARTRIDGES. here to give a few points. The main shaft was sunli 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…
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