A history of the growth of the steam-engine . Fza. 84.—^Engine, Boiler, and Scrow-Propellers used by SteveiiB, 1804. or safety tubular boiler, as it would be called to-day, thehigh-pressure condensing engine, with rotating valves, andtwin screw-propellers, as just described, is given a place ofhonor in the model-room, or museum, where it contrasts. Fie. 85i—Stevenss Screw Steamer, 1804. singularly with the mechanism contributed to the collectionby manufacturers and inventors of our own time. The huband blade of a single screw, also used with the same ma-chinery, is likewise to be seen
A history of the growth of the steam-engine . Fza. 84.—^Engine, Boiler, and Scrow-Propellers used by SteveiiB, 1804. or safety tubular boiler, as it would be called to-day, thehigh-pressure condensing engine, with rotating valves, andtwin screw-propellers, as just described, is given a place ofhonor in the model-room, or museum, where it contrasts. Fie. 85i—Stevenss Screw Steamer, 1804. singularly with the mechanism contributed to the collectionby manufacturers and inventors of our own time. The huband blade of a single screw, also used with the same ma-chinery, is likewise to be seen 266 THE MODERN STEAM-ENGINE. Stevens seems to have been the first to fully recognizethe importance of the principle involved in the constructionof the sectional steam-boiler. His eldest son, John CoxStevens, was in Great Britain in the year 1805, and, -whilethere, patented another modification of this type of his specification, he details both the method of construc-tion and the principles which determine its form. He saysthat he describes this invention as it was made known tohim by his father, and adds : From a series of experiments made in Frailce, in 1790,by M. Belamour, under the auspices of the Royal Academyof Sciences, it has been found that, within a certain range,the elasticity of steam is nearly doubled by every addit
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
