A history of the growth of the steam-engine . an injection-haildle, M A pump-rod, W, leads down fromthe beam to the cold-water pump, by which water is raisedfrom the well or other source to supply the needed injection-water. The air-pump rod also serves as a plug-rod, towork the valves, the pins at m and i2 striking the lever, m,at either end of the stroke. When the piston reaches thetop of the cylinder, the lever, m, is raised, opening thesteam-valve, B, at the top, and the exhaust-valve, E, at thebottom, and at the same time closing the exhaust at thetop and the steam at the bottom. When the
A history of the growth of the steam-engine . an injection-haildle, M A pump-rod, W, leads down fromthe beam to the cold-water pump, by which water is raisedfrom the well or other source to supply the needed injection-water. The air-pump rod also serves as a plug-rod, towork the valves, the pins at m and i2 striking the lever, m,at either end of the stroke. When the piston reaches thetop of the cylinder, the lever, m, is raised, opening thesteam-valve, B, at the top, and the exhaust-valve, E, at thebottom, and at the same time closing the exhaust at thetop and the steam at the bottom. When the entrance ofSteam at the top and the removal of steam-pressure below JAMES WATT AND HIS INVENTIONS. 119 the piston has driven the piston to the bottom, the pin, R,strikes the lever, m, opening the steam and closing theexhaust valve at the bottom, and similarly reversing the posi-tion of the valves at the top. The position of the valves ischanged in this manner with every reversal of the motionof the piston as the crank turns over the Fis. 31.—Boulton & Watts Double-Acting EDgiue, 1784. The earliest engines of the double-acting kind, and ofany considerable size, which were built to turn a shaft, werethose which were set up in the Albion Mills, near Black-friars Bridge, London, in 1786, and destroyed when themills burned down in 1791. There -were a pair of theseengines (shown in Fig. 27), of 50 horse-power each, andgeared to drive 20 pairs of stones, making fine flour andmeal. Previous to the erection of this mill the powerin all such establishments had been derived from wind-mills and water-wheels. This mill was erected by Boul- 120 THE DEVELOPMENT OF THE MODERN STEAM-ENGINE. ton & Watt, and capitalists working with them, not onlyto secure the profit anticipated from locating a flour-millin the city of London, but also with a view to exhibit-ing the capacity of the new double-acting rotating en-gine. The plan was proposed in 1783, and work was com-menced in 1784; but
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
