A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES. Vol. XXV.—No. 2C. t $3 per Annum. NEW YORK, DECEMBER 23, 1871. WEW SERIES. ] I [IN ADVANCE.] … COFFER DAM, MAIN SHAFT, AND EH TRANCE TO HEADINGS, HELL GATE, EAST RIVER. THE TUNNELING AND BLASTING OPERATIONS AT HELL around, and over which was once Diamond Reef. A contract tween 700 and 800 yards square of the reef were blown GATE, EAST EIVER NEW YORK. was soon made to have the debris removed,…
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