A history of the growth of the steam-engine . heaviest engine yet constructed in the United States is saidto be one in use on the Philadelphia & Reading Railroad, PORTABLE AND LOCOMOTIVE ENGINES. 371 having a weight of about 100,000 pounds, which is carriedon 12 driving-wheels. A locomotive has two steam-cylinders, either side byside within the frame, and immediately beneath the forwardend of the boiler, or on each side and exterk)r to the engines are non-condensing, and of the simplest possibleconstruction. The whole machine is carried upon strong butiiexible steel springs. The stea
A history of the growth of the steam-engine . heaviest engine yet constructed in the United States is saidto be one in use on the Philadelphia & Reading Railroad, PORTABLE AND LOCOMOTIVE ENGINES. 371 having a weight of about 100,000 pounds, which is carriedon 12 driving-wheels. A locomotive has two steam-cylinders, either side byside within the frame, and immediately beneath the forwardend of the boiler, or on each side and exterk)r to the engines are non-condensing, and of the simplest possibleconstruction. The whole machine is carried upon strong butiiexible steel springs. The steam-pressure is usually morethan 100 pounds. The puUing-power is generally about one-fifth the weight under most favorable conditions, and be-comes as low as one-tenth on wet rails. The fuel employedis wood in new countries, coke in bituminous coal districts,and anthracite coal in the eastern part of the United general arrangement and the proportions of locomotivesdiffer somewhat in different localities. In Fig. 127, a Brit-. FiG. 12T.—British Ejtpresa Engine. ish express-engine, 0 is the boiler, N the fire-box, X thegrate, G the smoke-box, and P the chimney. /S is a springand R a lever safety-valve, T is the whistle, Z, the throttleor regulator valve, E the steam-cylinder, and W the driv-ing-wheel. The force-pump, B C, is driven from the cross-head, D. The frame is the base of the whole system, andall other parts are firmly secured to it. The boiler is madefast at one end, and provision is made for its expansionwhen heated. Adhesion is secured by throwing a proper 372 THE STEAM-ENGINE OF TO-DAT. proportion of the weight upon the driving-wheel, W. Thisis from about 6,000 pounds on standard freight-engines,
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
