. Practical points in the use of X-ray and high-frequency currents . Fig. 8.—Motor Circuit Breaker. When the electric motor is in operation, it causes the section E tomove back and forth so that the current is made broken between thetwo large contact surfaces D and E. This operates very satis-factorily with currents of not more than five or six amperes. plan as the vibrator used on the ordinary f aradicmedical coil, the only difference being that it isvery much larger, and instead of small contactpoints they are made at least half an inch indiameter, the same as on the interrupter abovedescrib
. Practical points in the use of X-ray and high-frequency currents . Fig. 8.—Motor Circuit Breaker. When the electric motor is in operation, it causes the section E tomove back and forth so that the current is made broken between thetwo large contact surfaces D and E. This operates very satis-factorily with currents of not more than five or six amperes. plan as the vibrator used on the ordinary f aradicmedical coil, the only difference being that it isvery much larger, and instead of small contactpoints they are made at least half an inch indiameter, the same as on the interrupter abovedescribed. This makes the simplest type ofmechanical interrupter, but, like the mercury 30 X-Ray and High-Frequency Currents interrupter, it can not be operated at as slowa rate as the one run by the separate motor.(See Fig. 9.) Electrolytic interrupters. These depend fortheir efficiency upon the decomposition of sul-. Fig. 9.—Illustrates the latest type of vibrating circuit breaker. A BC represents a mica condenser, the binding posts H and Hare connected in series with the X-ray coil. The circuit is made andbroken at D and E. These contacts are very large, being about\ in diameter. This operates most satisfactorily in conjunction withan X-ray coil that is used for X-ray treatment or for operating highfrequency transformer. It requires practically no attention andalways works. It makes very little noise. phuric acid and the liberation of hydrogen. Thehydrogen bubbles being electrified, carry minutecharges of electricity between two terminals ofsimilar or dissimilar metals immersed in thesulphuric acid. The Coil and Accessories 31 The Wehnelt Interrupter. This consists ofa glass or porcelain jar, filled for about one-thirdits depth with a solution of sulphuric acid andwater, from one in four to one in ten. Into thisjar projects a lead coil, or a lead collar is claspedabout a central, hollow, porcel
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