Chapter 3
INTERMEDIATE APPARATUS
Interrupters or Breaks—Induction Coils—Valve Tubes, etc.
[Appended to this chapter will be found an explanation of the action of an induction-coil with vibrating break, and instructions for use, which we have by request dealt with in some detail.]

FOR excitation of an X-ray tube, we have seen to be required an electric current of very high potential or electro-motive force. No source other than a static machine directly supplies current of sufficiently high potential; therefore, unless in the case of such machine, a transformer must be interposed between the source and the X-ray tube. For this purpose an induction-coil is ordinarily used. But the current supplied to an induction-coil must be a regularly interrupted current, and to produce such interruption an auxiliary piece of apparatus is usually employed, known as the interrupter or break.

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