A history of the growth of the steam-engine . » H 384 THE STEAM-ENGINE OF TO-DAY. or a little over 2^ pounds per horse-power. The construc-tion of such a vessel occupies, usually, about a year, andcosts a quarter of a million dollars. The non-condensing direct-acting engine is used princi-pally on the Western rivers, driven by steam of from 100to 150 pounds pressure, and exhausts its steam into the at-mosphere. It is the simplest possible form of direct-actingengine. The valves are usually of the poppet variety,and are operated by cams which act at the ends of long. t-f Fio. 138.—A Mississippi
A history of the growth of the steam-engine . » H 384 THE STEAM-ENGINE OF TO-DAY. or a little over 2^ pounds per horse-power. The construc-tion of such a vessel occupies, usually, about a year, andcosts a quarter of a million dollars. The non-condensing direct-acting engine is used princi-pally on the Western rivers, driven by steam of from 100to 150 pounds pressure, and exhausts its steam into the at-mosphere. It is the simplest possible form of direct-actingengine. The valves are usually of the poppet variety,and are operated by cams which act at the ends of long. t-f Fio. 138.—A Mississippi Bteamtoat. levers having their fulcra on the opposite side of the valve,the stem of which latter is attached at an intermediatepoint. The engine is horizontal, and the connecting-roddirectly attached to cross-head and crank-pin without inter-mediate mechanism. The paddle-wheel is used, sometimesas a stem-wheel, as in the plan of Jonathan Hulls of one and MARINE ENGINES. 385 a half century ago, sometimes as a side-wheel, as is mos|usual elsewhere. One of the most noted of these steamers,plying on the Mississippi, is shown in the preceding sketch. The largest steamer on the Mississippi is the GrandRepublic, a vessel 340 feet long, 56 feet beam, and 10} feetdepth. The draught of water of this great craft is but 3^feet forward and 4^ aft. The two sets of compound engines,28 and 56 inches diameter and of 10 feet stroke, drivewheels 38|- feet in diameter and 18 feet wide. The boilersare of steel. A steamer built still later on the Ohio has thefollowing dimensio
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
