A brief sketch of the plan and advantages of a sectional floating dry dock, combined with a permanent stone basin and platform, and connected with level bedways, sliding ways, and housed slips for repairing, launching, and laying up in ordinary the ships of the United States Navy

New York: Jared W. Bell, 1844. Large folding lithograph broadside, 17.5" x 31"; original yellow printed covers present but separated, lacking the 32 pages of text originally bound with; waterstains, covers soiled and chipped, a couple small closed tears at folds, but otherwise sound. 4 copies in OCLC From an article in the Mechanics Magazine: "The operation of the whole is as follows: - The sections of the dock are hauled out into the river, and water let into them until they sink deep enough to allow the vessel to be floated in. As soon as this takes place, and the vessel is properly secured, the water is pumped out of the sections, and the vessel raised out of the water. When this has been accomplished, the whole is floated into the stone basin and allowed to ground on the bottom, when the vessel may be hauled on the railway. This is effected by means of a hydraulic cylinder, of 36 inches in diameter and 12 feet stroke, worked by an engine of 40 horses power. If necessary, two vessels may be put on the railways, and a ship of the line and frigate left on the dock, so that the capacity of the dock is equal to four vessels of large class. When required, additional ways may be put up in connection with the basin. The whole will be completed during 1851, but some of the sections will be ready this season." Item #54497

Price: $125.00

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