. Motion picture electricity. tant irrespectiveof the amount of load on its secondary. In order to reduce the amount of magnetic leak-age, the primary and secondary coils of a ConstantPotential transformer should be mounted veryclose together or one on top of the other on thesame core modern constant potential transformers are usuallymade with two primary and two secondary coils, eachcoil having its terminals brought outside of the trans-former case, permitting the primary coils and secondary MOTION PICTURE ELECTRICITY 55 coils to be connected in series or parallel as may be re-quired
. Motion picture electricity. tant irrespectiveof the amount of load on its secondary. In order to reduce the amount of magnetic leak-age, the primary and secondary coils of a ConstantPotential transformer should be mounted veryclose together or one on top of the other on thesame core modern constant potential transformers are usuallymade with two primary and two secondary coils, eachcoil having its terminals brought outside of the trans-former case, permitting the primary coils and secondary MOTION PICTURE ELECTRICITY 55 coils to be connected in series or parallel as may be re-quired for different voltages and for either 2-wire or3-wire system. Fig. 25 shows the four primary and four secondaryterminals. Suppose each primary coil is wound for 1,000volts and each secondary coil for 100 volts, then if theconnections are made as illustrated in Fig. 26, the trans-former may be operated on 1,000-volt line to deliver 100volts on the secondary, because the primary and secondarycoils are now connected in 200 VOLTS Fig. 27
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