. The medical and surgical uses of electricity. . ectrolysis or in ordinary galvanization are not avail-able for galvano-cautery—vice versa, galvano-cautery batteries are of butlittle use in electrolytic operations or in ordinary galvanizations. Theexplanation is to be found in the chapter on Ohms Law. The galvano-cautery current is obtained directly from the ordinarygalvano-cautery batteries or from storage batteries, sometimes called ac-cumulators. Accumulators possess advantages over galvano-cautery bat-35 546 ELECTRO-SURGERY. teries from the fact that they are thoroughly constant and do no
. The medical and surgical uses of electricity. . ectrolysis or in ordinary galvanization are not avail-able for galvano-cautery—vice versa, galvano-cautery batteries are of butlittle use in electrolytic operations or in ordinary galvanizations. Theexplanation is to be found in the chapter on Ohms Law. The galvano-cautery current is obtained directly from the ordinarygalvano-cautery batteries or from storage batteries, sometimes called ac-cumulators. Accumulators possess advantages over galvano-cautery bat-35 546 ELECTRO-SURGERY. teries from the fact that they are thoroughly constant and do not have tobe plunged into and out of the acid. Furthermore, an accumulator yieldsmore than twice as many ampere hours as the ordinary cautery battery ofthe same size. In the large towns where the low-pressure street currentis available,the storage battery is far preferable; but in the smaller townsnot possessing this advantage, or where the cautery is used only occasion-ally, the galvano-cautery battery will answer the better purpose. Batteries. Fig. i8o.—The G. F. Cautery Battery (Van Hoiiten & Ten Broeck). for galvano-cautery that do good work are made by almost every manufac-turer. Those who make a large use of galvano-cautery will probably requiretwo kinds of batteries—portable and stationary—just as they require port-able and stationary faradic and galvanic apparatus. An efficient cautery battery is represented in Fig. i8o, consisting of theordinary zinc-carbon elements. The current, which is regulated by meansof a rheostat, is sufficient to heat all ordinary-sized electrodes and elements are readily raised and lowered by means of the crank onthe top in the centre. One of the most successful attempts to combine a suitable degree ofstrength with compactness and lightness has, perhaps, been made in thebattery represented by Fig. i8i. It is composed of but two hard-rubbercells, with elements of zinc and carbon—each cell measuring 3^ inches inlength, 2^ inch
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