. The medical and surgical uses of electricity : including the X-ray, Finsen light, vibratory therapeutics, and high-frequency currents . l, without shock. The portable dry battery (Fig. 67) is run by a modification APPARATUS FOR ELECTRO-THERAPEUTICS. 279 of the Leclanche cell which yields a fairly high electro-motive force, hasa low internal resistance with the great recuperative power of this well-known cell. The cells are connected in series, and the two terminals ofthe series are connected with the Vetter carbon current-controller, which ismounted on the top of the case. The aver
. The medical and surgical uses of electricity : including the X-ray, Finsen light, vibratory therapeutics, and high-frequency currents . l, without shock. The portable dry battery (Fig. 67) is run by a modification APPARATUS FOR ELECTRO-THERAPEUTICS. 279 of the Leclanche cell which yields a fairly high electro-motive force, hasa low internal resistance with the great recuperative power of this well-known cell. The cells are connected in series, and the two terminals ofthe series are connected with the Vetter carbon current-controller, which ismounted on the top of the case. The average life of these cells is fromone to three years, according to use, and the current is steady and con-stant. The Barrett is another excellent dry-cell apparatus, readily port-able and of remarkable constancy. The exciting elements are zinc and chloride of silver, and it gives eighthundred hours of work before it is exhausted. Fig. 68 represents a very complete keyboard through which can beoperated cells of any description. The Law cell is mostly used with thiscontrivance, and they give a most constant, uniform, and steady Fig. 65. This advantage it shares with all the various constant batteries. The ex-planation of the constancy and steadiness of the current from these com-binations of the Law cell is found in the fact that on account of thefeebleness of the solution the chemic action is slow and uniform, with nointerruptions or even variations. The cabinet battery (Fig. 69) is furnished with forty or more cells o£the Fitch Perfect Battery. The galvanic circles, with double-cell se-lectors, wire coil rheostat, pole changer, automatic rheotome, and the vari-ous switches to bring into circuit the milliammeter, automatic rheotome,and water rheostat, are mounted on a vertical base, and the faradic coilsof high tension, water rheostat, and the binding posts are placed on ahorizontal base of polished hard rubber. The cells are arranged onshelves in the lower part of the c
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Keywords: ., bookauthorrockwell, bookcentury1900, bookdecade1900, bookyear1903
