Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.

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A view of Garratt's Portable Primary Battery, for medical purposes, consisting of 1, 10, 25, 50, or 100 adjustable elements. (See page 1H.) A view of Humboldt's Battery, consisting of one primary element. (See page 113.) A view of GarratCs Sponge Electrode, insulated with rubber, gutta percha, or glass, for medical purposes.