. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Massey wired-cotton electrode pads: 1, abdominal pad for general use; 2, spinal pad; 3. large dispersing pad. with a battery tip, by winding it about the end of the tip, the electrodeis complete. Various other styles of large pad electrodes have beendevised, examples of which are shown in Figs. 110, 145, and 146. Whenstrong currents are used they should be covered with soap and water. GALVANIC, FARABIC, AND SINUSOIDAL CURRENTS 197 If it is desired to employ the agent more extensively, in orderof th
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Massey wired-cotton electrode pads: 1, abdominal pad for general use; 2, spinal pad; 3. large dispersing pad. with a battery tip, by winding it about the end of the tip, the electrodeis complete. Various other styles of large pad electrodes have beendevised, examples of which are shown in Figs. 110, 145, and 146. Whenstrong currents are used they should be covered with soap and water. GALVANIC, FARABIC, AND SINUSOIDAL CURRENTS 197 If it is desired to employ the agent more extensively, in orderof their value may be mentioned a good static machine. Meansof obtaining the sinusoidal (Fig. 151) and high frequency currents, thestatic machine can be utilized for obtaining the latter (p. 36 and Fig. IGO)and various special electrodes (pp. 229 and 235).. Motor generator converting the direct to an alternating current; a sinusoidal wave current is produced. When using street currents it may be necessary at times, when a newsocket is first used, to ascertain its polarity; this may be done as describedon page 389. Also, if the available current is of the alternating type,a rectifier (p. 87) must be used. RULES TO BE OBSERVED IN THE APPLICATION OP GALVANIC,FARADIC, AND SINUSOIDAL CURRENTS Observation of the following rules is most important:It is necessary to cover the electrode for two reasons, first, the baremetal, owing to its electrolytic effect, would, in the case of the constantcurrent especially, be excessively painful and irritating; second, as thedry skin is a poor conductor, it is necessary that it be moist for thecurrent to affect the tissues beneath, therefore the electrode must becovered with something which will hold moisture. For this purpose a covering consisting of a thick layer of absorbentcotton dipped in either warm wa
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