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MANAGERS AND PROJECTIONISTS 563
circumstances, unless the coil he damaged and require rewinding. There are four of these pole pieces and eight bolts, two bolts per pole piece. Bolts 30, Plate 1, hold inner poles 10, Plate 2, in place, and should not be removed under any circumstances unless the coil is burned out and requires rewinding.
Remember the switchboard sets directly over the machine, as shown in Plate 1. With each machine there is furnished three cork pads, 2 inches square by 1 inch thick, which are to be placed under the feet of the machine, where they act as a cushion, absorbing noise and vibration. It is not necessary nor do we recommend screwing the machine to the floor with lag bolts. Its weight is sufficient to hold it in place.
ELECTRICAL CONNECTIONS— TYPE MA SINGLE ARC
REXOLUX
In Plate 5, lines G-G show the direct current circuits. The current from the positive generator brush passes out at 4 G, thence over the evenly dotted line to switch B (G, Plate 1), which when closed, connects, after passing through the ammeter, with the positive carbons of the arc lamp. From the negative brush of the generator the current passes through the various interpole coils in series, then out at — G thence similarly up to the negative side of switch B, and thence to the arc. In order to obtain the necessary field regulation, the extra lead from the shunt field is brought through the frame at F, Plate 5, and thence up to the field regulating resistance. The voltmeter is connected across the terminals of the arc at the right hand side of switch B. This completes the direct current connection for the type MA single arc Rexolux.
Were it not necessary to obtain a self-starting motor, in single phase machines, it would then require but one set of windings. In order, however, to obtain the necessary starting torque, a second set of wire coils is superimposed upon the main power coils. This set of starting coils is thrown out of phase with the power coils by inserting in series therewith a starting resistance and reactance, shown opposite starting switch A, Plate 5. The main power coils terminate in the frame at "Ml" and "M2," Plate 5, and the terminals of the extra starting coil at T, the other end of which is connected inside of the machine to the main power coils. The lines designated by a dash and a dot constitute the alternating current wiring of the system.
Where two or three phase current is supplied it is not