ut to long f inch joints) are all cut to lay half Inch joint. duct, wliich extends to a point midway between 115th and from the old bridge, which was carefully taken down, and the The backing of the walls, abutments, and hearting of the 116th streets, forming the third division of the work; it… … arches. Their places ar(- therefore sup- able difificulty was encountered. By far the plied by double wrought iron Post truss greater part was laid either in concrete or 19.-THE UNDERGROUND RAILWAY, NEW YORK CITY.-THE Fig. bridges, capable of supporting 3,000 lbs. on piles, the latter being used…
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