. The steam-engine and other heat-motors . s. This circulating water is often called injection-water asit enters the condenser, and is called discharge-water as it condensed steam is called feed-water, and the feed-pump isthe one that is used to force it into the boiler. Hot feed-watermust i r be lifted by the pump, as the pump-chamber will fillwith i por on the suction-stroke, and the requisite pressure willnot b tained on the delivery-stroke to force the water into theboilei 26 THE STEAM-EXGINE AND OTHER HEAT-MOTORS. Jet Condenser.—Fig. 17 represents a jet condenser and its air-pu
. The steam-engine and other heat-motors . s. This circulating water is often called injection-water asit enters the condenser, and is called discharge-water as it condensed steam is called feed-water, and the feed-pump isthe one that is used to force it into the boiler. Hot feed-watermust i r be lifted by the pump, as the pump-chamber will fillwith i por on the suction-stroke, and the requisite pressure willnot b tained on the delivery-stroke to force the water into theboilei 26 THE STEAM-EXGINE AND OTHER HEAT-MOTORS. Jet Condenser.—Fig. 17 represents a jet condenser and its air-pump. This is an old form that is rather uneconomical of space,but it illustrates the principles clearly, which is important. Theexhaust-steam enters the condenser by the pipe just above thewater-jet. The injection water and steam come into actual con-tact and assume a common temperature. The air-pump in thiscase is vertical (which is desirable) and contains three large cir-cular valves. These are made of hard rubber, are held fast in the. center, and are bent up in a saucer shape with an excess of pres-sure on the bottom side. The duty thrown on one valve shouldbe distributed among several valves. The lowest is the foot-valve, the one in the piston is a bucket-valve, and the top one isthe delivery-valve. Raising the piston reduces the pressure in thespace between it and the foot-valve. If the condenser pressureis greater than this, the foot-valve rises and water and more orless air or vapor enters the air-pump. The air passes through thewater so that when the piston descends the former passes firstthrough the bucket-valves of the piston. The water passingthrough last serves to seal the valves and fill the clearance small modern jet condenser is shown in Fig. 18. ELEMENTARY PRINCIPLES. 27 The Bourdon Gage (Fig. 19).—This gage is used to indicatepressures. These are indicated on a marked dial by the move-ment of a hand. The latter receives its motion through a
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