Scientific American. SEPTEMBER 30, 1876.] 215 were begun early in November, and con- advance more rapidly than the demoli- … Fig.3.-GROUND PLAN OF THE WORK AT HELL GATE. the reef. It is hence calculated that the work, Fig. 3, gives an excellent idea of the extent of the excavation, which is exterior effect, except an agitation of THE FORM OF THE REEF. Hallett’s Point Reef is in the shape of an irregular semi- e 770 feet…
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