Electrical news and engineering . L control equip-ment, the details of the K type arrangement may be morereadily understood. \\ ith the controller on the fifth notch, which is the full series position, the current comes fromthe trolley through switches LS, Rl and R3, then dividesthrough Nos. 1 and 3 motors, next goes through switch Sand liiially divides through Nos. 2 and 4 motors to the controller handle is moved toward the sixthnotch, switch Rl first drops out. Current then entersthrough switch R2, part of it going to the motors throughone section of the resistance and the remain
Electrical news and engineering . L control equip-ment, the details of the K type arrangement may be morereadily understood. \\ ith the controller on the fifth notch, which is the full series position, the current comes fromthe trolley through switches LS, Rl and R3, then dividesthrough Nos. 1 and 3 motors, next goes through switch Sand liiially divides through Nos. 2 and 4 motors to the controller handle is moved toward the sixthnotch, switch Rl first drops out. Current then entersthrough switch R2, part of it going to the motors throughone section of the resistance and the remainder through theother section and through switch R3, after which its pathis as before. The result, therefore, has been to insert re-sistance in the circuit. As the handle is moved further,switch G next closes. This allows the current to go directto ground, after dividing through Nos. 1 and \ motors, with-out passing through Nos. 3 and 4; that is, this short-circuitsNos. 3 and 4 motors. As the handle is moved still further, ^rotley. Sequence of Siwitcfies Mam Circuits Fig. 2 Trans, C - ^ ft. iisijii ^*« / 0 o o ^ 0 oo J o o o o o o 4 Ojoqx oooo o S o o o lO o o o o o o =, °A°^^ o o o o o oolol 1 o oooo 1 O O 7 o o o o 1 o S oo o o ill o 9 o o o o oooo /tf O O 0 o o o o o o o O Gn switch S then opens cutting off Nos. 2 and 4 motors fromthe series connection and switch P closes, connecting themin parallel with Nos. 1 and 3. The change to parallel isthen complete. It will thus be seen that this sequence ofchanges (.which, although requiring man} words to des-cribe, takes place in a small fraction of a second) main-tains a current, whose value depends on the design of theresistance, through Nos. 1 and 3 motors during the entiretime and thus maintains the speed of the car, instead ofallowing it to fall oil, as with the L type connection. The shutting-oflf of power from even one-half of themotors while changing from series to parallel, can be avoid-ed and current maintained in all o
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