. The Locomotive . Hl= ni. Typical Jet-Condenser Installation. 1921.] THE LOCOMOTIVE. 141 cut-off to the low-pressure cylinder and are governed by a variable cut-off in the high-pressure cylinder. With a very early cut-off in thehigh-pressure cylinder the low-pressure cylinder acts as a pump, draw-ing the steam from the receiver, and this action may continue to thepoint where the pressure in the receiver will be lower than atmos-pheric. This is particularly true of an engine operating condens-ing. The receivers of compound engines are, of course, or atleast should be, fitted with drain traps b
. The Locomotive . Hl= ni. Typical Jet-Condenser Installation. 1921.] THE LOCOMOTIVE. 141 cut-off to the low-pressure cylinder and are governed by a variable cut-off in the high-pressure cylinder. With a very early cut-off in thehigh-pressure cylinder the low-pressure cylinder acts as a pump, draw-ing the steam from the receiver, and this action may continue to thepoint where the pressure in the receiver will be lower than atmos-pheric. This is particularly true of an engine operating condens-ing. The receivers of compound engines are, of course, or atleast should be, fitted with drain traps but as these are some-times operative only when there is a pressure in the receivergreater than atmospheric the condition outlined above will cause sucha trap to cease its functioning. Inasmuch as continued operationunder these conditions must result in the accumulation of con-densation in the receiver, it is not long before the low pressurecylinder receives a harmful dose of water. Of course, the properapparatus to use for
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