A history of the growth of the steam-engine . on-densation. A jet of water was thrown directly into thecylinder, thus effecting for the JTewcomen engine justwhat Desaguliers had done for the Savery engine previ-ously. As thus improved, the Newcomen engine is shownin Fig. 19. Here b is the boiler. Steam passes from it through thecock, d, and up into the cylinder, a, equilibrating the pressureof the atmosphere, and allowing the heavy pump-rod, k, to It has been denied that a patent wa3 issued, but there is no doubtthat Savery claimed and received an interest in the new engine. THE MODERN TYPE. 5
A history of the growth of the steam-engine . on-densation. A jet of water was thrown directly into thecylinder, thus effecting for the JTewcomen engine justwhat Desaguliers had done for the Savery engine previ-ously. As thus improved, the Newcomen engine is shownin Fig. 19. Here b is the boiler. Steam passes from it through thecock, d, and up into the cylinder, a, equilibrating the pressureof the atmosphere, and allowing the heavy pump-rod, k, to It has been denied that a patent wa3 issued, but there is no doubtthat Savery claimed and received an interest in the new engine. THE MODERN TYPE. 59 fall, and, by the greater weight acting through the beam, i i,to raise the piston, s, to the position shown. The rod m car-ries a counterbalance, if needed. The cock d being shut, fis then opened, and a jet of water from the reservoir, g, en-ters the cylinder, producing a vacuum by the condensationof the steam. The pressure of the air above the piston nowforces it down, again raising the pump-rods, and thus theengine works on Fig. 19.—Newcomens Engine, A. d. 1705. The pipe h is used for the purpose of keeping the upperside of the piston covered vdth water, to prevent air-leaks—a device of ^ewcomen. Two gauge-cocks, c c, and a safety-valve, iVJ are represented in ti^gure, but it will be noticedthat the latter is quit^differAk from the now usual , the pressure used was haMly greater than that of t|atniosphere, and the weight of the valvj|^^^||rf(fclinrily,sufficient to keep it down, fihe aaj^^^ms. wmer, to-gether with the water of^ipoMensation^^^s off throughthe open pipe-f?. Newcomens first engnfimade 6 or 8 60 THE STEAM-ENGINE AS A TRAIN OF MECHANISM. strokes a minute ; the later and improved engines made 10or 12. The steam-engine has now assumed a. form that some-what resembles the modern- machine. The Newcomen engine is seen at a glance to have beena combination of earlier ideas. It was the engine of Huy-ghens, with its cylinder and piston as
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
