. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ition or phase of vibration, they all conspire toassist the motion, so that the amplitude increases until the increaseof the frictional losses absorbs the whole of the energy supplied. Onthe other hand, if the impulses are not in synchronism with the naturalvibrations, they no longer assist each other, and the motion producedis much less. The Resonator.—A form of resonator often used with high frequencyapparatus consists of a large spiral of one layer of wire wound on aninsulating support. The wire
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ition or phase of vibration, they all conspire toassist the motion, so that the amplitude increases until the increaseof the frictional losses absorbs the whole of the energy supplied. Onthe other hand, if the impulses are not in synchronism with the naturalvibrations, they no longer assist each other, and the motion producedis much less. The Resonator.—A form of resonator often used with high frequencyapparatus consists of a large spiral of one layer of wire wound on aninsulating support. The wire need not be coated with insulation, butthe adjacent turns are separated by a few millimeters so as to avoid a 1 Known as static induced and static wave currents. 102 APPLICATIONS OF ELECTROMAGNETIC INDUCTION short circuit. No condenser is used, as the capacity of the coil itselfis sufficient. Fig. 77 gives a diagram of the arrangement. One end ofthe resonator, indicated at R (the other letters having the same meaning Fig. 77 S^ S ^^^^^5^^^^^^^ I DArsonval oscillator with 78. High frequency or Gudin resonator. as before), is connected to a point on the main oscillating circuit;the other end is left free. If now the capacity and inductance of theresonator are such that it is in tune with the main circuit, the discharge ELECTRICAL OSCILLATIONS 103 of the latter will excite oscillations of considerable amplitude in it, sothat the free end will undergo alternations of potential sometimes muchlarger than those in the exciting circuit. This will become manifest bya powerful brush discharge which appears at this point. For the maximum effect the frequencies of the two systems mustcorrespond. Even when this correspondence is once attained, it will be
Size: 1105px × 2261px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidelectricityitsme00pott
