. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . tached to tlic train pipe ex-haust port of the brake valve. This sideof the retaining valve has the exhaustport in it and is connected to the carsby a pipe that extends throughout thetrain. It has the other side of the du-plex gauge attached also. This is the equipment for the engine. der, having more than fourteen poundspressure, will move the diaphragm, openthe exhaust port in the retaining valve,and the excess pressure will pass out. The engineers brake valve must havea port in it for rele
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . tached to tlic train pipe ex-haust port of the brake valve. This sideof the retaining valve has the exhaustport in it and is connected to the carsby a pipe that extends throughout thetrain. It has the other side of the du-plex gauge attached also. This is the equipment for the engine. der, having more than fourteen poundspressure, will move the diaphragm, openthe exhaust port in the retaining valve,and the excess pressure will pass out. The engineers brake valve must havea port in it for releasing the air fromthe retaining valve and small opening should be very small sothat we can reduce one pound if desired,for every car will reduce the same as theengineer reduces the pressure on theretaining valve in the engine. September^ lyoj- AND LOCOMOTIVE ENGINEERING 47 CORRESPONDENCE. Not Service, but Emergency Only. In llic July niiiiibtr (Jiicitiuii 54, , I note a mistake. It says: He canalso apply brakes in service position aswell as in emergency if he FIG. 1. HURST ALITOM.\TIC RETAINER. Willi Ibe P. R. R. cnt-out cock closedthe train line exhaust is closed and brakescannot be applied in service brakes are to be applied by the secondengineer it must be done by using thedirect application port. The copper pipeleading from the train line pipe to end ofcut-out cock supplies air to keep rotaryvalve seated when cock is closed, as main Fiij. 6 D Ml reservoir air has been cut off. The othersmall copper pipe coupled to angle fit-ting at brake valve and to cut-out cock isfor the train line exhaust. C. L. jMiller, Harrisburg, Pa. Engr. P. R. R. [An oversight by us. Our corre-spondent is correct.—Ed. J A Recently Patented Four-Way Cock. I have just been granted a patentwliich relates to certain new and usefuliniprovcmcnls in four-way cocks adaptedfor use ill connection with an air-braketrain line. In the accompanying drawings I
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
