. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FK;. 17. BANK OK ORCONTACTORS. Q. How much current passes throughthese control circuits? A. This amount varies, depending onthe voltage of the third rail and the de-sign and resistance of the solenoid. Anaverage volume would be from 10 to 15amperes. Q. What is the general arrangementof the control circuits? A. A tap is made to the main supplyand connected to the master master controller, composed of lin-gers and a drum, connects the voltage towires leading to the sole
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FK;. 17. BANK OK ORCONTACTORS. Q. How much current passes throughthese control circuits? A. This amount varies, depending onthe voltage of the third rail and the de-sign and resistance of the solenoid. Anaverage volume would be from 10 to 15amperes. Q. What is the general arrangementof the control circuits? A. A tap is made to the main supplyand connected to the master master controller, composed of lin-gers and a drum, connects the voltage towires leading to the solenoids in theswitches. The flow of current throughthe wire coil, or solenoid, creates a mag-. FIG. 18. MASTER CONTROLLER ELECTRO-MAGNETIC SYSTEM. netic field and the pull of this field isapplied to operate and close the The switches are grouped to-ve-ther as shown in Fig. 17. Q. What is tlie construction of tliemaster controller? A. A view of the master controllerwith cover removed is shown by Fig. consists of a drum D composed ofsegments S which are of greater diam-eter and arranged so that as the handleH is revolved, revolving the drum Dthe segments S are brought into contactwith the fingers F. Each finger is con-rected by a wire to one of the switchsolenoids and current passes from thedrum through the finger to the solenoidand the sw^itch is closed. As noted in thephoto Fig. 18 the segments are so ar-ranged or located on the drum that theswitches will be closed in the correctprogression and combination to giveproper operation of the motors. Q. What protective features are usedin connection with the electro-magneticcontroller and why? .■\. .Arc deflec
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