. Practical electricity in medicine and surgery. amo machine, called -TheMedical Dynamo, which seems to meet the requirements of thephysician. In addition to furnishing the required current forcautery work, it will at the same time give a lighting-powersufficient for rhinoscopic or laryngoscopy work. The advantageof this combination must be readily evident. This machine isshown in Fig. 212. 244 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. Electrodes for Galvano-cautery.—The cautery electrodesconsist of knives (flattened loops of platinum wire), fine andbroad points, and loops. The conducting
. Practical electricity in medicine and surgery. amo machine, called -TheMedical Dynamo, which seems to meet the requirements of thephysician. In addition to furnishing the required current forcautery work, it will at the same time give a lighting-powersufficient for rhinoscopic or laryngoscopy work. The advantageof this combination must be readily evident. This machine isshown in Fig. 212. 244 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. Electrodes for Galvano-cautery.—The cautery electrodesconsist of knives (flattened loops of platinum wire), fine andbroad points, and loops. The conducting wires are of copper,a good conductor, while the burning-points consist of loops ofplatinum wire, which, offering more resistance to the current, isheated, while the copper wire is not at all or only slightlyheated by the current. On reference to pages 43-45, the readerwill find the reasons for this given more in detail. The practical use of the galvano-cautery requires a carefulstudy of the relations between electro-motive force, resistance,. Fig. 213.—Various-Shaped Burners and Combination Handles. and current; in other words, an understanding of Ohms example, the short loop of flattened wire constituting acautery knife offers little resistance to the passage of the cur-rent, and consequently requires only a low electro-motive force,probably an electro-motive force of not over two volts, whichwould be furnished by a single cell of a good storage batteryor by two cells of any good cautery battei*y. If, on the otherhand, a loop of Avire eight or ten inches long is to be heated,the resistance is very much increased, and a higher voltage ELECTRODES FOR GALVANO-CAUTERY. 245 (electro-motive force) would be requisite to overcome it, and toallow the current to produce the heating effect. It will be clear,then, at once to the reader that the mere possession of a cauteryoutfit will not insure success in any operation undertaken,unless the possessor has the requisite knowled
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
