. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Anode of a Wehnelt interrupter. Simon interrupter. Character of the Induction Coil Discharge.—It has been shown that theE. M. F. induced on breaking the circuit attains much higher valuesthan that in the opposite direction induced when the circuit is closed(see Fig. 65). When the secondary circuit is completed through a solidor liquid conductor, the discharge will therefore be alternating but unsym-metrical. But if the discharge takes place through a gas, the inverseE. M. F. may not be sufficient t
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Anode of a Wehnelt interrupter. Simon interrupter. Character of the Induction Coil Discharge.—It has been shown that theE. M. F. induced on breaking the circuit attains much higher valuesthan that in the opposite direction induced when the circuit is closed(see Fig. 65). When the secondary circuit is completed through a solidor liquid conductor, the discharge will therefore be alternating but unsym-metrical. But if the discharge takes place through a gas, the inverseE. M. F. may not be sufficient to produce a spark, so that the dischargepasses in one direction only. The induction coil may therefore be usedto produce a unidirectional current of high potential through a gas,such as is needed for the operation of a:-ray tubes, etc. If the gas resistance is too low, or if the oscillations of the condenser are of great enough amplitude, an inverse discharge will be produced. Where it is important that the discharge should be wholly in one direction, a device known as a valve tube may be
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