. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . The Wills lamp in operation. at three feet, while the new lamp increases this distanceto nine. The iron in the Wills lamp is introduced as athin wire running through the core of the carbons. 486 ACTIXOTHERAPY The Bang Lamp. This is an apparatus devised by Bang while an assistant to Finsen. The object of this device is to produce a cool hght witha maximum of active rays. Iron electrodes cooled by waterflow
. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . The Wills lamp in operation. at three feet, while the new lamp increases this distanceto nine. The iron in the Wills lamp is introduced as athin wire running through the core of the carbons. 486 ACTIXOTHERAPY The Bang Lamp. This is an apparatus devised by Bang while an assistant to Finsen. The object of this device is to produce a cool hght witha maximum of active rays. Iron electrodes cooled by waterflowing through their hollow interior, or in larger apparatusthe electrodes are placed in a receptacle filled with water. Fig. Dermo lamps on Bang model. The arc in the small lamp is at a distance of only onecentimetre and a half at most from the skin when in use. In practice it has been found that the light does not pene-trate sufficiently for lupus, but may be used in superficialaffections. Experimentally it has been shown by Jansenthat rays of short wave length are least penetrating, andsince the iron arc produces such short waves its lack ofdeep penetration is explained. PHOTOTHERAPEUTIC APPARATUS 487 A modified Bang lamp is shown in Fig. 102. Iron electrodesreplace the carbon. They are enclosed in a metal chamberhaving two side openings. A water-cooling chamber is attached to one, a coloredwindow to the other. The lenses are quartz. Any intensityof light from 750- to 1500-candle power can be utilized. The Gorl^ and Leduc Lamp. This was conjointlysuggested in 1901 by those whose names it bears afterexperimentally observing that an electric spark, whetherproduced by a coil or a static machine, was rich in
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