. Practical electricity in medicine and surgery. of cells can be thrown into circuitwhen wanted. In many of the stationary apparatuses nowbefore the profession the current selector or switch is defectivein this particular, there being no way of picking out cells in the 232 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. series, unless the first cells are also included. Most recentdevices have this defect corrected. Purchasers of stationaryelectrical apparatus should insist upon being furnished with theform of switch known as the Universal Current Selector,by means of which any individual cell,
. Practical electricity in medicine and surgery. of cells can be thrown into circuitwhen wanted. In many of the stationary apparatuses nowbefore the profession the current selector or switch is defectivein this particular, there being no way of picking out cells in the 232 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. series, unless the first cells are also included. Most recentdevices have this defect corrected. Purchasers of stationaryelectrical apparatus should insist upon being furnished with theform of switch known as the Universal Current Selector,by means of which any individual cell, or number of cells in theseries, may be switched into circuit. Commutator, or Pole Changer.—For the purpose of rapidreversal of the direction of the current (voltaic alternation),nearly all galvanic batteries have a simple switch, called acommutator, attached. By means of this arrangement thedirection of the current, or, what is the same thing, the relativepositions of the poles, can be changed without removing the c? o a ep JL .mmmMm^ v«i\. Fig. 192.—Lewis Pedal Commutatorand Rheotome.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
