. The Röntgen rays in medical work . Fig. 54.—X-Ray Cabinet (Sanitas Company). It may be more convenient to have the coil on a movable trolley,and to connect to the mains by means of a cord with counter-weight suspended from the ceiling, just as is done in the case ofelectric lighting pendants. The cord may then terminate in a THE ELECTRICAL APPARATUS 01 lamp-socket, which can be slipped on to a plug fixed on the trolleyor on the base board of the coil. If a shunt-circuit resistance beused to lower the pressure of supply, this can occupy a place onone of the adjoining walls. The interrupter ma
. The Röntgen rays in medical work . Fig. 54.—X-Ray Cabinet (Sanitas Company). It may be more convenient to have the coil on a movable trolley,and to connect to the mains by means of a cord with counter-weight suspended from the ceiling, just as is done in the case ofelectric lighting pendants. The cord may then terminate in a THE ELECTRICAL APPARATUS 01 lamp-socket, which can be slipped on to a plug fixed on the trolleyor on the base board of the coil. If a shunt-circuit resistance beused to lower the pressure of supply, this can occupy a place onone of the adjoining walls. The interrupter may be given a placeeither on the trolley itself or upon a shelf in a convenient cornerof the room; electrolytic interrupters may even be placed in adistant room or cellar, as they need very little attention. By thisdevice one can enjoy the advantage of noiselessness when doingx-ray work. Protecting Devices. — The risk of producing injury by. Fig. 55.—X-Ray Tkolley for Wakd Use (Cox). exposures to x-rays has led to the introduction of various protectingdevices. Two separate conditions of danger must be guardedagainst: one is the risk of acute dermatitis in the patient, andthe other is the risk of chronic dermatitis and other troubles in theoperator. Formerly, when x-rays were used for therapeutic purposes it wascustomary to cover the healthy parts around the affected region bymeans of a sheet of thin lead in which a hole had been cut of asize and shape to suit the part under treatment. Then if dermatitiswere set up by the treatment its extent was limited by the size 92 THE RONTGEN RA YS IN MEDICAL WORK of the opening in the leaden screen. Subsequently the use of specialtherapeutic tubes was recommended, and as lead-glass is compara-tively opaque to x-rays, the tubes were constructed of this material,and were provided with a window of thin soda-glass at the endof a special prolongation or side-tube. Thus the emission of a
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