International Library of Technology · Scranton, International Textbook Co. · leaf 140
th all railway generators,and are connected in series with the shunt-field winding, sothat the field current, and hence the voltage of the generator, §20 ELECTRIC RAILWAYS. 51 may be adjusted. The field resistance is not intended to beused for regulating the voltage to suit the variations in… … Fig. 21. Field rheostats used on railway boards are made in a greatvariety of designs, but in all cases they consist of a resist-ance split up into a large number of sections that are con-nected to a multipoint switch, so that any amount of resist-ance may be cut in or out. In some styles the…
Electrical engineering
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