. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . t run mustnecessarily be made at the minimum r. that will generate rated voltage andcurrent. Dejails of a series of tests conductedby the committee were presented, and thereport concluded with an opinion of thecommittee that a method of rating axlegenerators is one of the essential por-tions of an axle generator committee, while they realize thatit is impossible to draw complete detailedspecification that would be applicable toall types of axle generator equipment asnow
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . t run mustnecessarily be made at the minimum r. that will generate rated voltage andcurrent. Dejails of a series of tests conductedby the committee were presented, and thereport concluded with an opinion of thecommittee that a method of rating axlegenerators is one of the essential por-tions of an axle generator committee, while they realize thatit is impossible to draw complete detailedspecification that would be applicable toall types of axle generator equipment asnow commercially manufactured, never-theless believe that there are a numberof essential characteristics that are com-mon to all types of axle generators andwliich would lie included in completespecifications. The committee thereforerccoirinended that they be instructed toinvestigate this matter with a view todrawing up a partial specification whichwill include the features common to allaxle generator equipment. Tank Cars Wih the war came the necessity for thetransportation of various products, among. IVIK (IK { AU CKNKR \|( IK strength must vary in-versely as the train speed, atid therutorethe maximum field current will be at theminimum train speed. As the heat:ng ofthe generator is due principally to theenergy dissipated in the fields and arma-ture, the maximum heating must occur aian r. p. m. of the armature that will^!ene^atc sufficient voltage to ;- the ihem loxic li(|u (Is for lilling shells, notrre\iously handled in cars. The com-mittee has given considerable time to thedevelopment of designs of cars for thispurpose, principally in connection with theEngineering Division of the United StatesOrdnance Department. .Some of the toxicli(|ui(ls had low rates of expansion, so thatthe queslioii of pre-sure was not material. 200 RAILWAY AND LOCOMOTIVE ENGINEERING July, 1919 the one important requirement being thatleakage must not occur. The Class
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