A history of the growth of the steam-engine . Fw. 114.—Semi-Portatle Engine, 1S78. sion, nor are the bearings overheated by conduction or byascending heat from the boiler. The fly-wheel is at thebase, which arrangement secures steadiness at the highspeed which is a requisite for economy of fuel. The boil-ers are of the upright tubular style, with internal fire-bo2^ PORTABLE AND LOCOMOTIVE ENGINES. 349 and are intended to be worked at 150 pounds pressure perinch. They are fitted with a baffle-plate and circulating-pipe,to prevent priming, and also with a fusible plug, which willmelt and prevent
A history of the growth of the steam-engine . Fw. 114.—Semi-Portatle Engine, 1S78. sion, nor are the bearings overheated by conduction or byascending heat from the boiler. The fly-wheel is at thebase, which arrangement secures steadiness at the highspeed which is a requisite for economy of fuel. The boil-ers are of the upright tubular style, with internal fire-bo2^ PORTABLE AND LOCOMOTIVE ENGINES. 349 and are intended to be worked at 150 pounds pressure perinch. They are fitted with a baffle-plate and circulating-pipe,to prevent priming, and also with a fusible plug, which willmelt and prevent the crown-sheet of the boiler burning, ifthe water gets low. Another illustration of this form of engine, as built insmall sizes, is seen below. The peculiarity of this engine. Tia. 115.—Semi-Portable Engine, 1878. is, that the cylinder is placed in the top of the boiler, whichis upright. By this arrangement the engine is constantlydrawing from the boiler the hottest and driest steam, andthere is thus no liability of serious loss by condensation,which is rapid, even in a short pipe, when the engine isseparate from the boiler. The engine illustrated is rated at 10 horse-power, andmakers are always expected to guarantee their machines to 350 THE STEAM-ENGINE OP TO-DAY. work up to the rated power. The cylinder is 7 by 7 inches,and the main shaft is directly over it. On this shaft arethree eccentrics, one working the pump, one moving thevalves, and the third one operating the cut-off. The driv-ing-pulley is 20 inches in diameter, and the balance-wheel30 inches. The boiler has 15 IJ-inch flues. It is furnishedwith a heater in its lower portion. The boiler of this en-gine is tested up to 200 pounds, and is calculated to carry100 pounds working pressure, though t
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
