. Motion picture electricity. Fig. 24 Fig. 24 illustrates another type also much used, whichis called the shell type transformer. In this design thereare three legs, the middle one is usually of double thecross-section as compared with the two outside legs and 54 MOTION PICTURE ELECTRICITY the primary and secondary coils are mounted on the mid-dle leg as illustrated. Either the core type or shell type transformer givessatisfactory results and there are certain advantagesclaimed for both types. As a matter of fact as far as effi-ciency and regulation is concerned there is not muchchoice and eit
. Motion picture electricity. Fig. 24 Fig. 24 illustrates another type also much used, whichis called the shell type transformer. In this design thereare three legs, the middle one is usually of double thecross-section as compared with the two outside legs and 54 MOTION PICTURE ELECTRICITY the primary and secondary coils are mounted on the mid-dle leg as illustrated. Either the core type or shell type transformer givessatisfactory results and there are certain advantagesclaimed for both types. As a matter of fact as far as effi-ciency and regulation is concerned there is not muchchoice and either one may be used with safety and satis-factory results. The determining factor in making a se-lection of the two being simply a matter of choice with thedesigner. o a o. V-V r=Sr^\/ni -re ==*» Fig. 25 VOLTS Fig. 26 The constant potential transformer must havethe lowest possible amount of magnetic leakage inorder to maintain the voltage constant 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 illustrate
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