. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . high enoughto cause illumination of a lamp, as shown on page 218, to illuminatea Geissler tube or vacuum electrode brought within three or fourfeet of the patient connected to a terminal of the coil, and if the Teslacoil is used, to produce a;-rays sufficient to give a good picture of thethorax or shoulder-joint. The voltage should be high enough to give a fine effluve at a distanceof eight inches or more from the patient, which distance can be reducedto four inches without sparking the patient. It
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . high enoughto cause illumination of a lamp, as shown on page 218, to illuminatea Geissler tube or vacuum electrode brought within three or fourfeet of the patient connected to a terminal of the coil, and if the Teslacoil is used, to produce a;-rays sufficient to give a good picture of thethorax or shoulder-joint. The voltage should be high enough to give a fine effluve at a distanceof eight inches or more from the patient, which distance can be reducedto four inches without sparking the patient. It is advisable to measurethe amount of current used; for this purpose a hot wire meter (p. 79)may be employed (Fig. 167). Strong has devised a method which isless expensive and approximately gives the amount of current. Itconsists of employing a 16-candle-power incandescent lamp arranged asshown in Fig. 168. The amperage is indicated by the degree of full illumination indicates the passage of 500 milliamperes; brightred, about 200 milliamperes; and a dull cherry red, 50 Lamp bulb hand-electrode. The insulated conducting cord is attached to the Tesla terminal bythe clip b, and the current passes through the lamp d, and thence to patient via the metal handle a.(Strong.) Contraindications to Use.—There is no practical method by which theexact frequency can be estimated. Contraindications to the use of high frequency currents are the presenceof low arterial tension, a degenerated heart muscle, acute inflammationof any of the viscera, infectious fevers, and advanced tuberculosis.^ Itis very important when administering the first treatment to a patientto remember that he may be apprehensive, therefore great cautionshould be used not to cause pain or discomfort. The high frequencyspark is painful, and, if sufficiently strong, may cause an ugly burn. 1 In incipient tuberculosis they may be of therapeutic value (p. 312). 220 RULES FOR USING STATIC AND HIGH FREQUE
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