Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 53
an alter-nating current is utilized and the interruptions aresupplied directly from the dynamo. The voltage ofthe secondary current depends upon the proportionbetween the number of turns of wire in the secondaryto the number of turns in the primary. If, for in-stance, the secondary coil has twice… … Fig. 16.—Ring type of transformer. the same time. The transformer is a step-up or step-down transformer, depending upon whether thesecondary has a greater or less number of turns thanthe primary. For Rontgen-ray work the step-up EXCITING THE RONTGEN-RAY TUBE 41 transformer is necessary. The ring…
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