. Dental and oral radiography : a textbook for students and practitioners of dentistry . ing current and aside from controlling andmeasuring apparatus, it consists of two principal parts,a step up transformer and a rectifying switch, whichconsist of a large micinite disc operated upon a synchron-ous motor. Where the direct current only is available a rotaryconverter is added to change the direct current to analternating current before it enters the step-up trans-former. In the operation of such a machine an alternat-ing current either from the source of current supply orfrom the rotary convert
. Dental and oral radiography : a textbook for students and practitioners of dentistry . ing current and aside from controlling andmeasuring apparatus, it consists of two principal parts,a step up transformer and a rectifying switch, whichconsist of a large micinite disc operated upon a synchron-ous motor. Where the direct current only is available a rotaryconverter is added to change the direct current to analternating current before it enters the step-up trans-former. In the operation of such a machine an alternat-ing current either from the source of current supply orfrom the rotary converter, as the case may be, is sentthrough the primary of the step-up transformer. Thisinduces a current in the secondary of the proper voltage,but alternating in character. The rectifying switch then X-RAY MACHINES 55 changes this current from an alternating to a direct cur-rent and as such it is delivered to the terminals of thetube. The principles involved in operating either witha direct or alternating current are shown in Fig. interrupterless transformer is, as stated before,. SYHCHROHOUS MOTOR
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