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

To sum up, then, I can say from my own experience in elec- tro-medical practice, I find that for constant galvanism the Dan- iell's battery, or Garratt's battery is the best, because of the moderate, uniform, and long persistent action. For cauterization, and all those operations where we require a quick white heat and rapid chemical decomposition, the Bun- sen's battery, improved, is for this purpose the best; but twice or three times the number of Grove's batteries will answer well. Fig. 12. A Series of Grove's Batteries in a Box, 12 in number. For producing the common induction current of electro-mag- netism, Smee's battery, as heretofore described, is the cleanest and most persistent, and for these reasons the best; but the copper cup, with its large zinc cylinder, that is run with sul- phate of copper or blue vitriol, which is indeed the Bcrzelius battery, and more extensively used in our country than any other, answers very well; only it is to be taken apart every time it is used, and it is better still if it is also thus often cleansed. Therefore, for these purposes, I should prefer the friction plate machine for static electricity; Daniell's or Garratt's battery for galvanic currents; Bunsen's or Grove's batteries, as im- proved, for the heat and decomposition; Smee's, or Berzelius's battery, for Faradaic currents. Humboldt Battery. This is something new, although the principle of its action was known to the great Baron and philosopher nearly seventy years ago; but the term Humboldt battery originates with the author. The convenience and usefulness of this very cheap, portable, durable, and least troublesome of all galvanic arrange- 10*