. Bulletin - United States National Museum. Science. Rigged Model (USNM 160306) is a reconstruction of the twin- screw steamboat, or launch, tried out by Stevens in 1804 in New York Harbor. The original boat used the engine and boiler (1811 yg) in the Watercraft Collec- tion. {Snnlhwnian photo r^nro.) STEX'ENS' MULTITUBULAR BOILER, and STEAM ENGINE, 1804 Full-Sized Machinery, usnm 181179 The machinery consists of the original boiler and en- gine employed in a twin-screw steamboat designed by Colonel John Stevens and built at Hoboken, New Jersey, in 1803-04. The boat was tested in in New York H
. Bulletin - United States National Museum. Science. Rigged Model (USNM 160306) is a reconstruction of the twin- screw steamboat, or launch, tried out by Stevens in 1804 in New York Harbor. The original boat used the engine and boiler (1811 yg) in the Watercraft Collec- tion. {Snnlhwnian photo r^nro.) STEX'ENS' MULTITUBULAR BOILER, and STEAM ENGINE, 1804 Full-Sized Machinery, usnm 181179 The machinery consists of the original boiler and en- gine employed in a twin-screw steamboat designed by Colonel John Stevens and built at Hoboken, New Jersey, in 1803-04. The boat was tested in in New York Harbor in May 1804, when a speed of 4 miles per hour was obtained. The boiler is of the multitubular design patented by Stevens in 1791 and 1803, having 28 copper tubes each Iji inches in diameter and 18 inches long. The boiler has a small rectangular chest, 14 tubes project from each of two sides of it. The grate is at one end of the projecting tubes; the heat passes around these, under the chest, and then around the tubes at the opposite end and to the smokestack. The Stevens boiler was designed for higher pressure than the Watts boilers used in England, and his boilers were the forerunners of the American high-pressure boilers used later on American locomotives and steamboats. The engine is a single-cylinder, high-pressure type, having a cylinder 4li inches in diameter and a stroke of 9 inches, noncondensing and fast turning. The engine and propeller shafts are in one unit. The difficulties that discouraged Stevens from fol- lowing up the tests of 1804 with a larger boat can be understood bv inspection of the engine and boiler. Both are crudely built. There were at that time neither tools nor skilled workmen in the L^nitcd States that would enable him to produce machinery and boilers well enough made to withstand high- pressure steam and to produce the speed of engine revolution desirable in Stevens' plan of using twin- screw propulsion. In 1844 the boiler and engine were rep
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
