rried by 7% foot deck trusses, and its brickwork or interior finish. blocking, generally of 14 X 14 inehescross section, the distribution of the underpinning and ways being weight is 127-7 tons. It is hoisted by a cable hoist, and counter-weights are employed to facilitate the shown in the cuts.… … THE PARK AVENUE IMPROVEMENT IN NEW YORK CITY-THE TEMPORARY DRAWBRIDGE ON THE HARLEM RIVER. ham Association of Engineers, Mr. Bailings the author dinary system of blocks and falls and windlasses was the structure varying, the counter-weights should also- vary. They are accordingly distributed in 22…
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