. Practical electricity in medicine and surgery. contacts and so interfere with theefficiency of the apparatus. In spite, however, of these shortcomings the bichromatebatteries remain, at present, our best type of portable batteries,being moderate in price, furnishing a strong current, and, where 228 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. intelligently and carefully handled, not being very liable to getout of order Chloride of Silver Batteries.—For neatness, portability, andconvenience of arrangement the chloride of silver dry batteryshown in Fig. 187 leaves little to be desired. It is
. Practical electricity in medicine and surgery. contacts and so interfere with theefficiency of the apparatus. In spite, however, of these shortcomings the bichromatebatteries remain, at present, our best type of portable batteries,being moderate in price, furnishing a strong current, and, where 228 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. intelligently and carefully handled, not being very liable to getout of order Chloride of Silver Batteries.—For neatness, portability, andconvenience of arrangement the chloride of silver dry batteryshown in Fig. 187 leaves little to be desired. It is made by theJohn A. Barrett Battery Company, of Baltimore, and the designerclaims to have secured a constant, uniform, and durable experiences with other forms of this battery, ,Gaiffes, have, however, not proven satisfactory. The firstexpense is considerable, and the life of the cell is too the chloride of silver is reduced to metallic silver, theusefulness of the battery is at an end until the eleirfents are. Fig. 188.— Improved Du Bois-Reymond Coil. replaced by others. The company making the battery shownabove offer to replace worn-out cells with new ones at a smallcost. Most of these portable galvanic batteries are also furnishedwith a faradic apparatus, but the physician should keep thesetwo instruments separate. Neither the portability nor efficiencyof the apparatus is increased by a combination of two differ-ent instruments in the same case. Faradic Batteries.—Faradic batteries are usually made inportable form. Unfortunately, there is, at present, no standardin use among American manufacturers. Many of the faradicmachines in the market are very imperfectly constructed. Thebest makers have adopted the Du Bois-Reymond coil as a FARADIC BATTERIES. 229 model, but in all except the more expensive instruments littlecare is taken to make a good, trustworthy apparatus. Thescale to indicate the coil distance, when furnished at all,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
