Identifier: roadsrailroadsve00londuoft (find matches)
Title: The roads and railroads, vehicles, and modes of travelling, of ancient and modern countries; with accounts of bridges, tunnels and canals, in various parts of the world
Year: 1839 (1830s)
Authors:
Subjects: Communication and traffic
Publisher: London, Parker
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: MSN

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ring the readerto the accompanying figure, which represents an approvedform of railway locomotive. We observe a strong cast-iron frame, A a, supportedon four Avheels, of which the two hinder and larger areare called the drivifig-w/ieels. On this carriage rests theboiler, b b, which is cylindrical in form, and is made ofplates of wrought-iron. The furnace, or stove, is at thehinder end, and the chimney in front. The former is acubical iron box, the lower part of which is seen at c; itssides and top are double, enclosing between them a layerof water about tlu-ee inches thick, which is constantlyreplenished by water descending from the boiler; for, asthe top of the stove is rather below the level of the waterin the boiler, this layer of Avater is always preserved ofthe same thickness, and the steam as it is generated passesup into the boiler. The smoke and hot air from the fireescape into a number of small tubes (of which there areabout ninety) which completely traverse the lower half of
Text Appearing After Image:
0 2 LOCOMOTIVE STEAM-ENGINE. 293 the boiler on their way to the chimney. So that nearlyall the heat, smoke, and hot air, from the furnace is turnedto the useful purpose of assisting to heat the water; andthe draught is increased by the waste steam being projectedup the chimney. Any pieces of ignited fuel, which maybe carried up with the draught, are prevented from es-caping into the air, and doing mischief, by a wire-netcapping on the top of the chimney. At E is the throttle-valve, which is moved by the engineer by means of a longrod F F, so as to regulate the supply of steam, and con-sequently the speed of the engine. From this valve thesteam passes by a large tube into the valve-box g, andthence into the top or bottom of the cylinder to work thepiston; it then escapes by the pipe H, into the chimney.The cylinder in this engine preserves its usual uprightposition, but in other engines almost every variety ofsituation and position has been tried for it; it has beenplaced horizontal, s

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