Download A Picture History of the Brooklyn Bridge by Mary J. Shapiro PDF

By Mary J. Shapiro

Profusely illustrated account of the best engineering fulfillment of the nineteenth century. infrequent modern pictures and engravings, observed by means of broad, specified captions, remember development, human drama, politics, even more. 167 black-and-white illustrations.

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55 . ' 80. Side view of cables, Brooklyn anchorage, 1877. The strands had to be lowered into place at the anchorage. The hea\y iron shoes that held the strands were temporarily located at the back of the anchorage throughout the spinning process. As soon as a strand was completed, its shoe would be lifted by a powerful block and tackle to the front of the anchorage, thus lowering the strand into place where it would eventually be wrapped together with the other 18 strands to form one of the four main cables.

Rocks, debris and other beneath the caisson's partitions. As several inches of earth were cleared from beneath the shoe, these wedges were knocked out of place from beneath the partitions, thereby lowering the caisson gradually and evenly. 44. Cross section of the Brooklyn caisson, 1870. A feature published two months later included this cross section of the entire caisson showing workmen climbing in and out of the air locks, the men above working the derricks which have already laid eight courses of stone for the towers.

Thus, each strand was permanently fastened by a chain of eyebars to the 23-ton anchor plate located beneath the anchorage. 81. Elevation of Brooklyn anchorage. 82. Top view of anchorage. Inside a huge shed built atop the Brooklyn anchorage were 32 drums, each measuring about 9' in diameter and 2 wide, and holding 10 miles of wire which had been previously oiled and spliced in the yard behind the Brooklyn anchorage. Every drum s equipped with spokes on one side so that the paying out of wire -rgulated by a team of workmen.

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