. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . y armature coil can,of , be varied so as to bring the brushes in the convenient position in the motor are always of carbon, and are placed where they can be easilyreached from the opening in the motor casing over the commutator. Motor Leads. The reversing of the current through thearmature, independent of the field current, to secure reversal ofdirection of rotation of the armature, makes
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . y armature coil can,of , be varied so as to bring the brushes in the convenient position in the motor are always of carbon, and are placed where they can be easilyreached from the opening in the motor casing over the commutator. Motor Leads. The reversing of the current through thearmature, independent of the field current, to secure reversal ofdirection of rotation of the armature, makes it necessary that fourwires enter the motor. The portions of these wires connected per-manently to the motor are termed the motor leads because theylead out the current. Sometimes an ordinary two-way connectoris used in connecting these leads to the wires of the cable, but oftena jack-knife connector is employed to facilitate connecting and dis-connecting. Considerable difficulty has been experienced by thewearing away of the insulation of the leads where they rest on themotor shell. To avoid this there has recently come into use a leadprotected by a spiral metal Fig. ■ Field C.)il. 10 E LEOTRIC KA T I.\VAYS
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