. Railway master mechanic . BOSWOKTH FEED WATER This appaiatus consists of the air pump operatedby the steam pump. 0, the pump governor, A(asabove described except that the orifice fl^ is closedand the escape of air from the cylinder is controlledby a valve o])erat€d automatically), and the regulator,Jf. This regulator isee Fig. 4 for larger cut) hasboiler connections in common with the water gauge, S,and is interposed between it and the water column. which secure the same fluctuations of waterlevel as take place within the boiler, and being out-side of it. the wate
. Railway master mechanic . BOSWOKTH FEED WATER This appaiatus consists of the air pump operatedby the steam pump. 0, the pump governor, A(asabove described except that the orifice fl^ is closedand the escape of air from the cylinder is controlledby a valve o])erat€d automatically), and the regulator,Jf. This regulator isee Fig. 4 for larger cut) hasboiler connections in common with the water gauge, S,and is interposed between it and the water column. which secure the same fluctuations of waterlevel as take place within the boiler, and being out-side of it. the water contained is cooled by radiation:a fact of great importance in this device. The regu-lator may be described as a half inch brass pipe hav-ing a rectangular return-bend, the horizontal legs ofwhich are about 8 inches long and 2 inches apart, allin the same plane. This return-bend is located so thatthe upper or steam-leg, Q. shall always be filled with. BOSWORTH FEED WATER REGULATOR-steam. while the lower or expansion-leg. P. have its horizontal diameter level with the prescribedwater line, to be alternately filled with hot steam or-cooler water as the latter slightly falls or rises byreason of its evaporation and the prompt supplyafforded by this device. Below the expansion-leg isan adjustable steel rod, N, connected at one end tothe upright part of the regulator and at the otherend to the lever which controls the valve. M. in theair pipe leading to the governor. To understand the automatic operation of the appa-ratus above described and illustrated, let us suppose that the water in the boiler is at its highest point, atwhich time the expansion-leg is full of water and thealve is closed: the pressure in the cylinder hasforced the piston dpwn, compressed the spiral spring,closed the throttle and stopped the pump. This con-dition of things lasts but a moment: evaporation isconstantly going on in the boiler and lowering thewater which
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