e carriage rear end there are five tanks for water ballast, and connected to it. The back boom is a box girder made up which supports the sheaves. This carriage bears two lifting tackles. One is a gantline or single fall, for light since its completion two auxiliary water tanks have of plates and… … THE NEW STEEL FLOATING DERRICK AT THE BROOKLYN NAVY YARD. ) 1891 SCIENTIFIC AMERICAN, INC.
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