. The treatment of disease by electric currents : a hand-book of plain instructions for the general practitioner . ade fluid when ready to put into the cells. The separate steps of mixing fresh battery fluid require buta moments time, although twelve or twenty-four hours shouldbe allowed for cooling before the elements are use a fluid so recently prepared that it is still warm, asit would attack the elements too rapidly and waste its strength. Meanwhile the zincs and carbons have been soaking in the TILK OK , iAlAAXIC lOLKClKO-ll 1 VS1(S. •5 strong salt solution wher
. The treatment of disease by electric currents : a hand-book of plain instructions for the general practitioner . ade fluid when ready to put into the cells. The separate steps of mixing fresh battery fluid require buta moments time, although twelve or twenty-four hours shouldbe allowed for cooling before the elements are use a fluid so recently prepared that it is still warm, asit would attack the elements too rapidly and waste its strength. Meanwhile the zincs and carbons have been soaking in the TILK OK , iAlAAXIC lOLKClKO-ll 1 VS1(S. •5 strong salt solution where they were placed when we began tomix the fresh solution. The water around them is now seento be discolored a greenish hue, and a sediment has collectedin the bottom of the pan. Lift the elements from the saltsolution, rinse them with plain Avater and wipe them thoroughlywith a soft rag. When as clean as they can be made they areready to return to the apparatus. The process is then com-plete. Although small portable galvanic batteries are not con-structed with a milliammeter or a rheostat, vet thev are ar-. Fig. 4a. A compact portable galvanic battery containing sixteen cells. ranged so that the current strength is increased by a singlecell at a time, and this answers instead of a current controllerfor many ordinary external applications with medium or largeelectrodes. Refinements of treatment, however, require refinements inmethods and apparatus. A meter should invariably be sup-plied in the circuit by the physician. It is easily clone. Sim- 70 THE ESSENTIALS VV GALVANIC ELECTRO-PHYSICS. ply place a pc)rtable milliammeter on the table beside thebattery and level it with the needle pointing at zero. Connecta short wire between the positive pole and one binding postof the meter. To the other binding post attach the conduct-ing cord from the positive electrode. Connect the other elec-trode to the negative pole of the battery in the usual the electrodes are applied
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