50 MODERN STEAM PRACTICE . The air pmnps for the injection System are either single or in duplicate , lying at an angle ; when one pump is used it is Fig . 223 . — Single Air Pump and Condenser . a , Condenser . b , Airpump , c , Air - pump cover . d , Exhaust passage . e , Hole for injection… … Fig . 224 . — Double Air Pump and Condenser . a , Condenser . b b , Air pumps . c C , Air - pump covers . d , Exhaust passage . e e , Hot wells . crank shaft , with one rod for the single pump and two rods on the same crank for the double arrangement . The rods have suitable crossheads for taking…
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