tric spark to a few centers Great pains were taken to delineate exactly the surface of of explosion would suffice to propagate it through the whole be taken not to shake the structure overhead by too heavy the rocks. The appropriation of 1871 was $225,000, just system, because the explosion of the… … operations had been ploring the r o ck Fig. 5.- THE CENTENNIAL MODEL OF THE HELL GATE^ WOEK. carried on, 896 linear ahead, was put in feet of tunnels had competition with it. been opened,and4,648 The cost of drilling, cubic yards of rock after a long trial with removed. The total the Burleigh…
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