. Hand-book of electro-therapeutics . troublesome at best. Some physicians seem to be afraid to usethe street current because of the frequent accidents which occuron the streets of large cities. One should remember that, in the GALVANISM. 29 accidents reported, the person iisualh^ falls on a non-insulatedwire, and so receives a full charge of electricity. As used in an office the current is alwa3s under such com-plete control, if one employ reliable apparatus, that an accidentshould never occur. The current should be the one suppliedfor lighting incandescent lamps. Two curi-ents are used forth
. Hand-book of electro-therapeutics . troublesome at best. Some physicians seem to be afraid to usethe street current because of the frequent accidents which occuron the streets of large cities. One should remember that, in the GALVANISM. 29 accidents reported, the person iisualh^ falls on a non-insulatedwire, and so receives a full charge of electricity. As used in an office the current is alwa3s under such com-plete control, if one employ reliable apparatus, that an accidentshould never occur. The current should be the one suppliedfor lighting incandescent lamps. Two curi-ents are used forthis purpose, the direct and the alternating. The direct currentis constant and is the one for physicians to use, as it veryclosely resembles the current obtained from a battery such as the. Fig. 8.—Transformer, alternating to direct current. (Victor.) .Leclanche. In using an alternating current, we must first, bymeans of a transformer, cut down the voltage and secondly,by means of a commutator, change the alternating current toa unidirectional one. For transforming alternating to direct current. A great many physicians suppose that the real danger inusing the street current lies in the sudden increase of the cur-rent strength. This is not at all the fact. The real danger inany large city lies in the leakage currents in both direct andalternating currents and, in the case of the alternating current,of a breaking down of the insulation between the primary and 30 ELECTRO-THERAPEUTICS. secondary transformers. If the neutral wire in a three-wiresystem should come in contact underground with gas or waterpipes, there may be carried into a house a large amount ofelectricity by means of the faucets in wash-stands and bath-tubs, or via the gas jets. The three-wire system may be
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