Channing, William F.(William Francis),1820-1901 · Boston : Thomas Hall · leaf 275
Pig. 30. No. 30. Medium Size Sulphate Copper Battery.Price, $5.00.2* 18 HALLS CATALOGUE … Pig. 31. Mo. 31. Danielss Protected Battery. The differencebetween this and Fig. 30 is, that the zinc cylinder is pro-tected by a porous cup. By this arrangement the batteryis more constant, and will remain in action for several days,but is not so powerful. Price, $2.00. No. 32. Large Size ditto.…
Electrotherapy · Medicine, Physical · Electricity
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