under Broadway had been service had reached an acute stage, it was in this di- the same problem and arriving simultaneously at the granted by the Legislature of the State of New York, rection that his first experimentation took place. He same solution. One of the most peculiar instances of this… … BEACH SHIELD USED IN THE BROADWAY TUNNEL IN 1869. HYDRAULIC SHIELD NOW IN USE IN THE BLACKWALL TUNNEL, LONDON. and plans were at once made for the construction of a Peter Barlow and Mr. J. H. Greathead. It is interest- first conceived of the idea of the shield and the use of nine-foot tunnel under…
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