An international system of electro-therapeutics : for students, general practitioners, and specialists . wire—say, No. 20—may be brought to a red heat,and with the second at least twelve inches of No. 16, the one giving acurrent of great intensity, which is required for a long, thin wire, and theother a greater volume of current, which is suited for heavy instruments,as dome-shaped cauterizers and the like. The manner in which thischange from quantity to intensity and vice versa is quickly effected willbe understood by referring to the diagram representing the platformwith its metallic connect
An international system of electro-therapeutics : for students, general practitioners, and specialists . wire—say, No. 20—may be brought to a red heat,and with the second at least twelve inches of No. 16, the one giving acurrent of great intensity, which is required for a long, thin wire, and theother a greater volume of current, which is suited for heavy instruments,as dome-shaped cauterizers and the like. The manner in which thischange from quantity to intensity and vice versa is quickly effected willbe understood by referring to the diagram representing the platformwith its metallic connections (Fig. 8). The mechanism of this apparatus as a whole, and the means bywhich these changes from intensity to quantity, and vice versa, areeffected, will become still more manifest by referring to Fig. 4. By theset-screws b b the two poles, P P and Z Z, are joined, thus converting thebattery into one of two double cells; while, if 6 6 be released and thesuspension rod G screwed down, the battery will represent four cells inseries; in either case the poles will be the same. The explanation of. Fig. 8.—Diagram of Platform. the extraordinary power obtainable from this arrangement lies in thefact that, by the peculiar construction of the negative plates, while weobtain the high electro-motive force of a platinum-zinc combination, wehave, at the same time, the conductivity of copper; and, as a conse-quence, no internal resistance to the current, except what is offered bythe thin stratum of fluid between the elements. By actual measurementthe internal resistance of each cell is less than ^^ ohm, while the electro-motive force reaches nearly 2 volts,—a result never heretofore attainedby any galvanic pair in bichromate solutions. In 1890 the writer exhibited a yet simpler form of battery, con-structed on the same principle, and, by invitation of Professor Pozzi,operated with it at the Lourcine-Pascal Hospital, in Paris. It consists ofplates arranged for two cells, but, as in
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
