. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . sis, while the Kunze-Knorr uses brake-shoe resistance as a basis. The Westinghouse uses whatpractically amounts to a safety valve that will permit thepressure to blow down to that regularly used for orifice of the safety valve is so arranged that the timerequired for the excess pressure to blow down to normalcorresponds with that in which the speed of the trainwould fall from a high speed, say of 60 miles per hour toone to which the normal brake shoe pressure would be ap-propriate
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . sis, while the Kunze-Knorr uses brake-shoe resistance as a basis. The Westinghouse uses whatpractically amounts to a safety valve that will permit thepressure to blow down to that regularly used for orifice of the safety valve is so arranged that the timerequired for the excess pressure to blow down to normalcorresponds with that in which the speed of the trainwould fall from a high speed, say of 60 miles per hour toone to which the normal brake shoe pressure would be ap-propriate. The Kunze-Knorr regulation, on the other hand, opensthe exhaust from the brake cylinder, when the brakeshoeresistance has risen to a point slightly below the adhesionof the wheel to the rail. In other words, when the co-efficient of friction multiplied by the pressure is a littleless than the coefficient of friction between the wheel andthe rail multiplied by the weight of the car. As the former coefficient is constantly increasing so is theresult of its multiplication by the brakeshoe German Brake Pressure Regulator The method by which this is accomplished is verypimple in theory, and will be readily understood by a ref-erence to the accompanying diagram. There is a lever H which is pivoted at the center brake hangers are attached to either end. and it is evi-dent that the frictional resistance of the two shoes tends toturn the lever in the same direction. An extension of this lever has a connection to a stemattached to the seats of the spring F. These are arrangedlike the draft springs on an .-\merican car, so that thespring is compressed regardless of whether the stem is intension or compression. Attached to the stem of thes])ring there is an arm leading out to a valve at T. Asthis arm is moved out of its normal position the valveopens the exhaust from the brake cvlinder. The spring is so adjusted in its seat that when the com-bined thrusts of the two brak
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
