. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . Mercurial interrupter. The mechanical interrupters make and break the circuitthrough a metallic contact. One of the simplest and bestof these is the slate-wheel interrupter, which breaks andmakes the circuit by coming in contact with a coppersegment. APPARATUS 91 The interrupters which are perhaps the most used arethe mercury interrupters, a form of which is the apparatusdevised by Levy, in which an Archimedean scr
. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . Mercurial interrupter. The mechanical interrupters make and break the circuitthrough a metallic contact. One of the simplest and bestof these is the slate-wheel interrupter, which breaks andmakes the circuit by coming in contact with a coppersegment. APPARATUS 91 The interrupters which are perhaps the most used arethe mercury interrupters, a form of which is the apparatusdevised by Levy, in which an Archimedean screw pumps upand forces out laterally the mercury through tubes. Themercury strikes the fingers of a rotating metallic diskconnected with one of the poles, but insolated from theother. The current is interrupted as the flow of mercurypasses from one finger into the other. The Cunningham is similar to the Levy interrupter, butdiffers from it in that here the screw and arms revolvewhile the fingers are stationary on their insolated segment. Fig. Wehnelt electrolytic interrupters. (Willyoung-Cunningham type ) A favorite in England is the Mackenzie-Davidson inter-rupter. In this machine the contact piece is rigidly attachedto the shaft of a motor. This shaft is placed at an anglearranged so that at each revolution the contact piece dipsinto the mercury. The electrolytic interrupters may be placed directly onthe no-volt circuit, making and breaking the circuit veryrapidly and producing a powerful secondary discharge. 92 GENERAL CONSIDERATIONS UPON RADIOLOGY The one constructed by Wehnelt consists of a glass tubethrough which passes a small platinum wire, a very smallportion of which projects through the sealed end of thetube. This is immersed in a mixture of sulphuric acid andwater, which also has a lead plate dipping into it. Theplatinum wire is connected with the positive and the leadplate with the negative end of the supply current, therebycompleting the circuit. The current i
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