A history of the growth of the steam-engine . bout terminal stations and for making uptrains; powerful, heavy, slow-moving engines, of largeboiler-capacity and with small wheels, are used on steepgradients and for hauling long trains laden with coal andheavy merchandise ; and hardly less powerful but quitedifferently proportioned express -engines are used forpassenger and mail service. A peculiar form of engine (Fig. 126) has been designedby Forney, in which the whole weight of engine, tender,coal, and water, is carried by one frame and on one set ofwheels, the permanent weight falling on the
A history of the growth of the steam-engine . bout terminal stations and for making uptrains; powerful, heavy, slow-moving engines, of largeboiler-capacity and with small wheels, are used on steepgradients and for hauling long trains laden with coal andheavy merchandise ; and hardly less powerful but quitedifferently proportioned express -engines are used forpassenger and mail service. A peculiar form of engine (Fig. 126) has been designedby Forney, in which the whole weight of engine, tender,coal, and water, is carried by one frame and on one set ofwheels, the permanent weight falling on the driving-wheelsand the variable load on the truck. These engines have alsoa comparatively short wheel-base and high lightest tank-engines of the first class mentionedweigh 8 or 10 tons ; but engines much lighter than these. 370 THE STEAM-ENGINE OF TO-DAY. even, are built for mines, where they are sent into the gal-leries to bring out the coal-laden wagons. The heaviestengines of this class attain weights of 20 or 30 tons. The. 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 diff
Size: 1023px × 2443px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
