Scientific American. 88 | FEBRUARY 8, 1896. Of course, only the outer drum The drums are stayed together by six- as the Grand Central Depot. On top Harlem River to Forty-second Street, of the drums is a series of eight steel a distance of nearly five miles. This … ments and of the bridge itself. bearings when it is closed. For The viaduct is a steel structure car- each end there are levers arranged ried on three rows of columns, each somewhat like toggle joints, which ble the weight of the lateral ones. levers are moved so as to give 3 inches sists…
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