Radiography and radio-therapeutics (1917) (14757504802)

Identifier: radiographyradio01knox (find matches)

Title: Radiography and radio-therapeutics

Year: 1917 (1910s)

Authors: Knox, Robert, 1868-1928

Subjects: Radiography Radiotherapy

Publisher: New York : Macmillan

Contributing Library: University of California Libraries

Digitizing Sponsor: Internet Archive

Text Appearing Before Image:

, shuwiiig switrli (-Zj. ami ^\vltl■ll-tul>le \vitli time \v).\\ ( 1),for using outfit as a rotating high-tension rectifier. Cabinet (3) contains single-impulsetransformer and rectifier, connected to an X-ray tube (1). portioned that the current may be adjusted from I milliampere to about80 milliamperes. When the apparatus is used for the taking of single-impulse radiogra))hsthe rotary rectifier is no longer used, hut only the high-voltage transformerbuilt into the apparatus. For single-impulse operation the transformer isno longer excited by the alternating current from the converter, but

Text Appearing After Image:

o ^it S, r- Ox,-3 2 • a c 3 SINGLE-IMPULSE A^D RAPID RADIOGRAPHY 53 obtains its current through the single-impulse switch from the continuouscurrent mains. The underlying principle of thesingle-impulsc method is briefly as follows:In the methods knowni hitherto, the current flowing through the primary wind-ing of the induction coil is suddenly interrupted after reaching its maximumintensity, i.e. at the moment when the iron core of the induction coil hasattained maximum saturation, and the result of the sudden disappearance ofthe flux is an inductive kick in the secondary winding. The force of thisinductive kick is considerably greater when the single-impulse methodis used inasmuch as the flux in the iron core does not merely drop from itsmaximum to zero but from a positive to a negative maximum. In con-sequence, the induction in the secondary wdnding must be particularlystrong, and the X-ray tube gives a flash of more than double the intensitythat would be obtained with a simple in

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1917

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