. Le traitement de la maladie par les courants électriques : un manuel d'instructions simples pour le généraliste. Repel et les pôles opposés atteleach autre. Cependant, l'appareil doit faire plus que simplement un interrupteur pour transformer un courant galvanique en courant de bobine d'induction, car le courant de cellule primaire est souvent employé dans le traitement d'un interrupteur dans le circuit sans perdre ses caractéristiques galvaniques de très petite tension et comparativement largeampérage. Ce que fait l'antenne est de transposer pratiquement ces PRINCIPES ESSENTIELS DE l'ÉLECTRO-PHYSIQUE FARADIC. 97 relations entre la tension et l'intensité

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. The treatment of disease by electric currents : a hand-book of plain instructions for the general practitioner . repel and opposite poles attracteach other. However, the device must do more than merely interruptto transform a galvanic current into an induction coil current, for the primary cell current is often employed in treatmentwith an interrupter in the circuit without losing its galvaniccharacteristics of very small voltage and comparatively largeamperage. What the coil does is to practically transpose these THE ESSENTIALS OF FARADIC ELECTRO-PHYSICS. 97 relations of voltage and amperage. The current comes out ofthe first coil with much higher E. M, F. than it went in, andwith its amperage reduced to a very small value ; and when asecond induction coil is placed over the primary coil the secondinductive process carries the current to a still greater height ofvoltage, and proportionately attenuates the current volume. The degrees of alternation by different coils are regulated formedical purposes by varying the diameter and length of thewire employed, and by making a greater or less number of. Fig. 15, represents a single vibrator faradic battery of low price for external appli-cations. It is not designed for fine and sedative applications, but is equal to anybattery below the high grade. It has an excellent coil of 4500 No. 32 wire tappedin three places. turns in winding. The aggregate of these turns in the com-pound coil of the authors apparatus is above 15, 000. While all galvanic currents of equal voltage and amperageare alike in quality and therapeutic action, regardless of theparticular style of apparatus from whence they are derived^ the7 98 THE ESSENTIALS OF FARADIC ELECTRO-PHYSICS. same is not true of faradic currents. Induction coil currentsnot only depend for their best qualities upon the best ap-paratus, but are only obtained when the apparatus is in properworking condition and adjustment. It is important to recog-nize the fact that there is no stand

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