A history of the growth of the steam-engine . a I s STATIONARY ENGINES. 313 225 to 250 horge-power. In this example, all parts are madeto exact size by gauges standardized to Whitworths sizes. In American engines (as is seen in fig. 96), usually, twosupports are placed—the one under the latter bearing, and. the other under the cylinder—^to take the weight of the en-gine ; and through them it is secured to the in the vertical engine akeady described, a valve issometimes used, consisting of two pistons connected by a14 314 THE STEAM-ENGINE OF TO-DAY. rod, and worked by an ordinary
A history of the growth of the steam-engine . a I s STATIONARY ENGINES. 313 225 to 250 horge-power. In this example, all parts are madeto exact size by gauges standardized to Whitworths sizes. In American engines (as is seen in fig. 96), usually, twosupports are placed—the one under the latter bearing, and. the other under the cylinder—^to take the weight of the en-gine ; and through them it is secured to the in the vertical engine akeady described, a valve issometimes used, consisting of two pistons connected by a14 314 THE STEAM-ENGINE OF TO-DAY. rod, and worked by an ordinary eccentric. By a simplearrangement these pistons have always the same pressure in-side as out, which prevents any leakage or blowing through ;and they are said always to work equally as well and freefrom friction under 150 pounds pressure as under 10 poundsper square inch, and to require no adjustment/ It is moreusual, however, to adopt the three-ported valve used onlocomotives, with (frequently) a cut-oflf valve on the backof this main valve, which cut-ofiE valve is adjusted eitherby hand or by the governor. Engines of the class just described are especially wellfitted, by their simplicity, compactness, and solidity, towork at the high piston-speeds which are gradually becom-ing generally adopted
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
