. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . W^hen the liquidin the worm cools, which follows thecutting off of the steam supplied to thecoils, the vapor of this liquid condensesand tlie spring G forces tlie valve open,allowing a fresh supply of steam to enterthe heating pipes and supply additionalheat to the car. By referring again to Fig. i, it will beseen that under these conditions of op- Jnnuary, Ipop. RAILWAY AND LOCOMOTIVE ENGINEERING 37 eration tlie heating s\stem is run witha drip that is open to the atmospherecontinually, and
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . W^hen the liquidin the worm cools, which follows thecutting off of the steam supplied to thecoils, the vapor of this liquid condensesand tlie spring G forces tlie valve open,allowing a fresh supply of steam to enterthe heating pipes and supply additionalheat to the car. By referring again to Fig. i, it will beseen that under these conditions of op- Jnnuary, Ipop. RAILWAY AND LOCOMOTIVE ENGINEERING 37 eration tlie heating s\stem is run witha drip that is open to the atmospherecontinually, and therefore there can beno pressure in any of the pipes in thecar or beyond the valve H, which canexceed atmospheric pressure, and alsothat the steam supply is regulated bythe automatic valve H admitting such densed steam will be compelled to passthrough the trap E, as the valve G isnow closed, and the spiral coil will,therefore, become cool and the steamvalve H will remain fully open. It isthus seen that in order to change fromthe pressure or high temperature sys-tem to the vapor or low temperature. l/n/i//nn/Jin;,u/i I-IG. I. quantity as may be necessary to keepthe pipes sufficiently warm with steam,or low pressure and corresponding tem-perature, and that this valve will beclosed when the pipes and the drip be-come sufficiently heated to generatepressure in the spiral pipe. Underthese conditions the temperature ofsteam in the heating pipes will be inthe neighborhood of 200 deg. Fahr., andwith moderate outside temperature orit a moderate inside temperature is de-sired at night for sleeping cars, a com-fortable temperature can be maintainedwithout a continual opening and clos-ing of the steam valve. In cold weather, if it be desired toincrease the heating capacity of thesystem, then by closing the drip valveF, the water of condensation must passthrough the trap E. This device iswell known, and is the trap that hasbeen used with the Gold system foryears, and which is called the ho
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