. Electric railways, theoretically and practically treated . f and to be able towithstand high temperatures without deteriorating. Thearmature conductors are cross-connected at the rear of thearmature, the top and bottom conductors joined by turnedcopper clips, easily removable, to provide for rewinding. The commutator is composed of 195 segments of harddrawn copper, insulated with mica. Each motor is provided with four field coils, each coilbeing wound on a metal spool, with strip copper, and insu-lated with mica cloth and asbestos. This form of construc-tion renders the coils impervious to m
. Electric railways, theoretically and practically treated . f and to be able towithstand high temperatures without deteriorating. Thearmature conductors are cross-connected at the rear of thearmature, the top and bottom conductors joined by turnedcopper clips, easily removable, to provide for rewinding. The commutator is composed of 195 segments of harddrawn copper, insulated with mica. Each motor is provided with four field coils, each coilbeing wound on a metal spool, with strip copper, and insu-lated with mica cloth and asbestos. This form of construc-tion renders the coils impervious to moisture and practi-cally fireproof. The motor is of the nose suspension type, and whenmounted upon 33 wheels has a clearance of 3^. Theweight of the motor complete without gear and gear caseis 3,966 lbs. 82 ELECTRIC RAILWAYS. Westinghouse No. 56 Railway Motor, — This motorhas a continuous capacity of 50 amj^eres, operating on apressure of 300 volts. This pressure is assumed to typifynormal pressure per motor, train operating at line pressureof 500 Fig. 45. — G. E. 66 RAILWAY MOTOR. The armature is wound with a two circuit winding,the standard fomi adopted by the Westinghouse slot contains three individual coils wound togetherand thoroughly insulated. The conductors are retained inposition by steel band wires which are depressed into thecore to prevent ripping should babbit in bearings melt andarmature strike pole tips. The weight of the armature andcommutator complete is 720 lbs. The commutator is composed of 117 hard drawn cop-per segments, insulated with mica. Due to the large size DIRECT CURRENT SERIES RAILWAY MOTOR. 83 of commutator this motor is not subject to flashing over, acharacteristic of small armatures. The motor is of the split frame type, the halves of the
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