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