Electro-therapeutics: a condensed manual of medical electricity . tance) is zinc rods are amalgamated with In the selection of a faradic coil the physician may begoverned by his own sensations, if they are not revoltedby the bare idea. The instrument must be capable ofyielding a minimum current, which is scarcely percep-tible to the tactile sense of the hand, but which can beraised to an intensity at least double that which a strong-nerved man is able to bear. Smoothness of current is 1 Described in Deutsches Archiv f. klin. Med., vol. vii, Heft 6. APPARATUS. 169 desira
Electro-therapeutics: a condensed manual of medical electricity . tance) is zinc rods are amalgamated with In the selection of a faradic coil the physician may begoverned by his own sensations, if they are not revoltedby the bare idea. The instrument must be capable ofyielding a minimum current, which is scarcely percep-tible to the tactile sense of the hand, but which can beraised to an intensity at least double that which a strong-nerved man is able to bear. Smoothness of current is 1 Described in Deutsches Archiv f. klin. Med., vol. vii, Heft 6. APPARATUS. 169 desirable; this depends very much on the mechanism ofthe hammer. An arrangement for increasing or dimin-ishing the rapidity of vibration of the hammer is desir-able, but not absolutely necessary. The best pocket-battery is probably that of Gaiffe(Fig. 23), which gives a current strong enough for mostpurposes, and is easily managed. The figure shows twolittle zinc-carbon elements, which require to be chargedwith bisulphate of mercury when the battery is used. Fig. Gaiffes Pocket-battery. The chloride of silver element, supplied with some ofthese batteries, is very liable to get out of order; the ele-ments here given are to be depended on. Hall andothers have constructed good portable batteries of some-what greater size. In applying electricity to the body, variously-shapedand constructed conductors, called electrodes or rheo-phores, are used. Such conductors, armed with a nakedmetal knob, are used for direct application to mucoussurfaces; a bit of cotton batting may be wound tightlyaround the knob, if we choose. When applied to theskin a naked conductor is painful, especially if it hasthe shape of a point, or of a bundle of points (wire- 170 ELECTRO-THERAPEUTICS. brush). To avoid pain, we employ a cap of thick cloth,or a fine sponge, which when in use arethoroughly wetted with (salt) water. These coverings Fig. 24.
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