where the thickness of of the kind that has been built in recent years across stopping by one reverse valve and starting mechanism. the wallis 11 feet. The wall is built with a concrete the Harlem River. Of these, the largest and most nota- The engines are arranged so that they car be readily… … are spaced 21 feet center to about two minutes to close center, and thus afford the traffic gates, release the three separate ways, of ends and swing the bridge which the outer two are roadways for vehicular traffic, to the full open position. Considering the great weight The total weight of the…
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