File:Radiography, x-ray therapeutics and radium therapy (1915) (14755157234).jpg

Identifier: radiographyxrayt00knoxuoft (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868-1928
Subjects: Radiography Radiotherapy X-rays
Publisher: London : A. & C. Black
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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ch is designed on theprinciple of the well-known commutatoremployed for dynamos and motors. This Fig. l.—GaifleEocliefort outfit for alterna- rectifier is COUpled mechanically and elec-ting or contiuuouscuneiit. For alternating tricallvwith the motor, alternating in such supply there IS a dmerence m the arrange- * • i i interrupter. (Medical a manner that Commutation takes place in synchronism with the frequency of thealternating current. For instance, if alternating current is available havinga frequency of 50 cycles per second, the rectifier -will give, in the sametime, one hmidred continuous current impulses, or expressed scientifically,the rectifier is in synchronism with the alternating current. The commutation of the rectifier always occurs at the moment when thealternating current is at zero value, that is, at the moment of the change ofdirection. When working accurately this arrangement practically preventsthe generation of inverse current which is so harmful to the tubes.
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ment of the Supply Association.) SINGLE IMPULSE APPARATUS 5 S)Tichronism is obtained simply and absolutely by emplopng a rotaryconverter which is connected to a continuous supply, and which at the sametime supplies the alternating currentto the transformer and rotates therectifier which is mounted on the sameshaft. Alternating Current High-tension Rectifier. — VThen using thealternating current, the cm-rent for thetransformer is derived direct from thesupply, the rectifier being driven by aself-starting single-phase synchronousmotor which takes the place of the con-verter. The outfits made for alternatingcurrent are smaller than for continuous,and these small outfits are withoutdoubt the best to use where ordinaryX-ray work only is required, that is notinstantaneous, as there is no troublefrom inverse radiation, no interrupterto svnchronise, no rectifier to attend

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