Archimedes ships steam engine6/10/2023 The use of such a boiler seventy years ago is even more remarkable than the adoption of the screw-propeller in such excellent proportions thirty years before the labors of Smith and of Ericsson brought the screw into general use. The whole is a most remarkable piece of early engineering. The hub and one blade of this screw are still preserved. 55) was a direct-acting, high-pressure condensing engine of ten inches diameter of cylinder, two feet stroke of piston, and drove a screw of four blades, and of a form which, even to-day, appears quite good. In another form, as applied to a locomotive in 1825, the tubes were set vertically in a double circle surrounding the fire. The furnace-gases passed among the tubes, down under the body of the boiler, up among the opposite set of tubes, and thence to the smoke-pipe. The fire was built at one end, in a furnace inclosed in this jacket. The whole of the lower portion was inclosed in a jacket of iron lined with non-conducting material. It consists of two sets of tubes, closed at one end by solid plugs, and at their opposite extremities screwed into a stayed water and steam reservoir, which was strengthened by hoops. Inch, at a time when the usual pressures were from four to seven pounds.
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