A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . rate of discharge is so high that anordinary voltaic battery cannot compete with it. 12 PHYSICS OF LIGHT AND CAUTERY §17 The method pursued above for ascertaining the current-strength is to use formula (o), Art. 128, Direct Currents. Thisis usually sufficient, but those who wish to go a little furthermay use formulas (d) and (<?), Art. 135, and formula (g),Art. 136. CURRENT-SUPPLY FOR THE CAUTERY 18. The Bichromate Cell.—Regarding the most con-venient method for supplying the current to t
A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . rate of discharge is so high that anordinary voltaic battery cannot compete with it. 12 PHYSICS OF LIGHT AND CAUTERY §17 The method pursued above for ascertaining the current-strength is to use formula (o), Art. 128, Direct Currents. Thisis usually sufficient, but those who wish to go a little furthermay use formulas (d) and (<?), Art. 135, and formula (g),Art. 136. CURRENT-SUPPLY FOR THE CAUTERY 18. The Bichromate Cell.—Regarding the most con-venient method for supplying the current to the cautery, it isneedless to say that the ordinary lighting circuit takes firstplace, next to this comes the accumulator, and last theprimary cells. Among the latter, the bichromate cell, Art. 35,Direct Currents, has occupied a prominent place, because it hasa high E. M. F., a comparatively low resistance, and is able todeliver a heavy current for some time without are many forms in the market, mostly consisting of acombination of a number of single elements. Fig. 2 shows a. FlO. 2 form provided with a tight cover, which allows the liquid tosplash about inside without spilling. In a bichromate cellthe zinc should always be removed when not in use, in orderto prevent local action. This is here accomplished by raisingthe cover and turning it around so as to place the plates inthe empty side of the case. The other half is divided intocell-compartments, each containing an electrolyte. Fig. 3 showsanother form where the electrolyte is kept in a bottle when notin use. Numerous other forms are produced, so as to make the §17 PHYSICS OF LIGHT AND CAUTERY 13 cells more portable. These cells all need a certain amount ofcare, if they are to be relied on when wanted. If not system-atically inspected, they are liable to fail when any heavyservice is required of them. In Arts. 92 and 94, Direct Currents, are given some particu-lars relating to the care of these cells.
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