. The Locomotive . r of I92I.] THE LOCOMOTIVE. 137 a multiple expansion engine. In the case of a compound engineit is well to warm the receiver and low pressure cylinder bymeans of the high pressure steam bypass to these parts, whensuch bypass exists, or by turning the engine over several timesby hand to permit the steam from the high pressure cylinder toflow on through the engine. By thus thoroughly warming theengine before starting the danger of producing a vacuum in theengine cylinder and thereby drawing any water from the exhaustpipe into the cylinder will be greatly reduced. When shutting
. The Locomotive . r of I92I.] THE LOCOMOTIVE. 137 a multiple expansion engine. In the case of a compound engineit is well to warm the receiver and low pressure cylinder bymeans of the high pressure steam bypass to these parts, whensuch bypass exists, or by turning the engine over several timesby hand to permit the steam from the high pressure cylinder toflow on through the engine. By thus thoroughly warming theengine before starting the danger of producing a vacuum in theengine cylinder and thereby drawing any water from the exhaustpipe into the cylinder will be greatly reduced. When shutting down an engine, there is a condition producedwhich makes the entrance of water into the engine cylinder fromthe exhaust pipe, should it be present there at such time insufficient quantity, an almost absolute certainty. In order tounderstand how this condition is produced, reference will be hadto some indicator diagrams. Fig. i shows a typical card or dia-gram for an average engine under load. The steam valve opens.
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