. Science of railways . so two,exhaust pipes are connected to this cock, one ex-tending over cab and exhausting directly into thefeed water in the tender, the other pipe extending tothe smoke box and live steam ports or steamchests. The branch pipes to the steam ports are pro-vided with check valves. A check valve is alsoplaced in the pipe leading to the smoke box. The three-way valve is for the purpose of con-ducting exhaust steam into the feed water or other-wise at the will of the engineer. Wlien, opened inopposite direction, and the engine is working steam,the exhaust is conducted to the s
. Science of railways . so two,exhaust pipes are connected to this cock, one ex-tending over cab and exhausting directly into thefeed water in the tender, the other pipe extending tothe smoke box and live steam ports or steamchests. The branch pipes to the steam ports are pro-vided with check valves. A check valve is alsoplaced in the pipe leading to the smoke box. The three-way valve is for the purpose of con-ducting exhaust steam into the feed water or other-wise at the will of the engineer. Wlien, opened inopposite direction, and the engine is working steam,the exhaust is conducted to the stack, but whenthe engine is shut off, the exhaust is admitted to thetwo steam chests and cylinders by the automaticopening of the checks in the two branch pipes. Thecheck in the pipe leading to the stack preventssmoke and cinders from being drawn into the cyl-inders when the engine is drifting. The live steam ports are provided with automaticdrip valves situated at the lowest point in cylinder LOCOMOTIVE APPLIANCES. 535. saddles for the purposeof draining condensa-tion when the engineis at rest. The small sectionalcuts shown above thelocomotive tender inthe accompanying en-graving clearly illus-trate the details of thecheck valves, dripvalves, etc., and theirlocation. Among the manyadvantages claimedfor this device are thefollowing: It is noiseless. Thisavoids the frighteningof teams or the annoy-ance to passengersaround stations. Itdoes not create a drafton the fire when theengine is at rest, asdoes the old method. This advantage re-sults in the saving offuel. It acts as a lubri-cator to the valves andcylinders when the en-gine is not workingsteam. The exhaust 536 LOCOMOTIVE APPLIANCES. steam from air pump circulates through the steamchests and cyhnders, keeping them at a uniformtemperature, not allowing them to chill in coldweather when engine is at rest, or overheating orcutting of cyUnders while drifting down gradedue to the friction of the piston traveling to andfro. The r
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