A history of the growth of the steam-engine . One of these engines, of 20 horse-power, has a steam-cylinder 10 inches in diameter and 18 inches stroke of pis- PORTABLE AND LOCOMOTIVE ENGINES. 355 ton, making 125 revolutions per minute, and has 9 squarefeet of grate-surface and 288 feet of heating-surface. Itweighs about 4^ tons. Steam is carried at 125 pounds. In the class of engines just described, the draught isobtained by the blast of the exhaust-steam which is ledinto the chimney. Such engines are now sold at from $120to $150 per horse-power, according to size and quality, thesmaller engin
A history of the growth of the steam-engine . One of these engines, of 20 horse-power, has a steam-cylinder 10 inches in diameter and 18 inches stroke of pis- PORTABLE AND LOCOMOTIVE ENGINES. 355 ton, making 125 revolutions per minute, and has 9 squarefeet of grate-surface and 288 feet of heating-surface. Itweighs about 4^ tons. Steam is carried at 125 pounds. In the class of engines just described, the draught isobtained by the blast of the exhaust-steam which is ledinto the chimney. Such engines are now sold at from $120to $150 per horse-power, according to size and quality, thesmaller engines costing most. The usual consumption of. Fio. 11T.—The Thrashers Eoad-Engine, 1878. fuel is from 4 to 6 pounds per hour and per horse-power,burning from 15 to 20 pounds on each square foot of grate,and each pound evaporating about 8 pounds of water. Ausual weight is, for the larger sizes, 500 pounds per horse-power. These engines are sometimes arranged to propel them- 356 THE STEAM-ENGINE OF TO-DAY. selves, as in the Mills Thrashers road-engine or locomo-tive, of which the accompanying engraving is a good repre-sentation. This engine is proportioned for hauling a tankcontaining 10 barrels, or more, of water and a grain-sepa-rator over all ordinary roads, and to drive a thrashing-ma-chine or saw-mill, developing 20 or 25 horse-power. Thisexample of the road-engine has a boiler built to work at250 pounds of steam ; the engine is designed for a maximumpower of 30 horses. This engine has a balanced valve and automatic cut-off,and is fitted with a reversing-gear for use on the driving-wheels are of wrought-iron, 56 inc
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
