. Practical electricity in medicine and surgery. 211.—Storage Battery for Galvaxo-Cacteey. Dynamo Machines.—Several European surgeons have useda small Gramme machine as the source of the energy requiredto heat cautery electrodes. Where steam, water-power, a gas-engine, or an electro-motor can be obtained, a dynamo machinefurnishes the ideal source of electrical energy for the compound machine of, say, a half horse-power will, so longas it is kept rotating at the proper rate of speed, furnish (1) acurrent of low electro-motive force and large quantity, suitable DYNAMO MACHINES. 243
. Practical electricity in medicine and surgery. 211.—Storage Battery for Galvaxo-Cacteey. Dynamo Machines.—Several European surgeons have useda small Gramme machine as the source of the energy requiredto heat cautery electrodes. Where steam, water-power, a gas-engine, or an electro-motor can be obtained, a dynamo machinefurnishes the ideal source of electrical energy for the compound machine of, say, a half horse-power will, so longas it is kept rotating at the proper rate of speed, furnish (1) acurrent of low electro-motive force and large quantity, suitable DYNAMO MACHINES. 243 for electro-cautery operations; (2) a current of high electro-motiveforce and small quantity, suitable for electrolytic work andthe general purposes of the medical electrician, and (3) a cur-rent by which an induction coil can be worked so as to give afaradic current. Naturally, this is only practicable for stationaryoutfits. For a portable apparatus the physician is still limitedto the ordinary and storage batteries. The Mcintosh Battery. Fig. 212.—The McIntosh Medical Dynamo. Company, of Chicago, makes a dynamo 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
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