A history of the growth of the steam-engine . the steam-pressure, and the amount of feed-water,were very carefully regulated, and all bearings were runquite loose; the engine-drivers were usually expert jock-eys. The next illustration represents the portable steam-en-gine as built by one of the oldest and most experiencedmanufacturers of such engines in the United States. In the boilers of these engines the heating-surface isgiven less extent than in the stationary engine-boiler, butmuch greater than in the locomotive, and varies from 10 to20 square feet per horse-power. The boilers are made v
A history of the growth of the steam-engine . the steam-pressure, and the amount of feed-water,were very carefully regulated, and all bearings were runquite loose; the engine-drivers were usually expert jock-eys. The next illustration represents the portable steam-en-gine as built by one of the oldest and most experiencedmanufacturers of such engines in the United States. In the boilers of these engines the heating-surface isgiven less extent than in the stationary engine-boiler, butmuch greater than in the locomotive, and varies from 10 to20 square feet per horse-power. The boilers are made verystrong, to enable them to withstand the strains due to theattached engine, which are estimated as equivalent to fromone-tenth to one-fifth that due to the steam-pressure. The 354 THE STEAM-ENGINE OF TO-DAY. boiler is sometimes given even double the strength usual?with stationary boilers of similar capacity. The engine ismounted, in this example, directly over the boiler, and allparts are in sight and readily accessible to the 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
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
