A history of the growth of the steam-engine . voir, P, whence itit is taken by the low-pressure cylinder, precisely as thesmaller cylinder drew its steam from the boiler. From thelarge or low-pressure cylinder the steam is exhausted intothe condenser. The valve-gear is usually a Stephensonlink, g e, the position of which is determined, and the re-versal of which is accomplished, by a hand-wheel, o, andscrew, m np, which, by the bell-crank, k i, are attached tothe link, g e. The box-framing forms also the surface-condenser is cleared by a single-acting air- MARINE ENGINES. 393 pump
A history of the growth of the steam-engine . voir, P, whence itit is taken by the low-pressure cylinder, precisely as thesmaller cylinder drew its steam from the boiler. From thelarge or low-pressure cylinder the steam is exhausted intothe condenser. The valve-gear is usually a Stephensonlink, g e, the position of which is determined, and the re-versal of which is accomplished, by a hand-wheel, o, andscrew, m np, which, by the bell-crank, k i, are attached tothe link, g e. The box-framing forms also the surface-condenser is cleared by a single-acting air- MARINE ENGINES. 393 pump, inside the frame, at T. The feed-pump and the bilge-pumps are driven from the cross-head of the air-pump. The successful introduction of the double-cylinder en-gine was finally accomplished by the exertions of a fewengineers, who were at once intelligent enough to under-stand its advantages, and energetic and enterprising enoughto push it forward in spite of active opposition, and pow-erful enough, pecuniarily and in influence, to John Elder. The most active and earnest of these eminent men wasJohn Elder, of the firm of Randolph, Elder & Co., subse-quently John Elder & Co., of Glasgow. Elder was of Scotch descent. His ancestors had, for 1 Vide Memoir of John Elder, W. J. M. Kankine, Glasgow, 1871. 394 THE STEAM-ENGINE OF TO-DAY. generations, shown great skill and talent in construction,and had always been known as successful millwrights. JohnElder was born at Glasgow, March 8, 1824, and died inLondon, September 17, 1869. He was educated at theGlasgow High-School and in the College of Engineering atthe University of Glasgow, where, however, his attendancewas but for a short time. He learned the trade under hisfather in the workshops of the Messrs. Napier, and becamean unusually expert draughtsman. After spending threeyears in charge of the drawing-office at the engine-buUdingworks of Robert Napier, where his father had been became a partner in the firm
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
