Electro-therapeutics: a condensed manual of medical electricity . eye and ear twenty are quite enough. Hospitals anddispensaries should be provided with sixty cells ; theInfirmary for the Paralyzed and Epileptic, in London,has one hundred. Solidity of construction is a great desideratum, andseems well attained in the batteries furnished by Dres-cher, Kidder, the Galvano-Faradic Company, Curt , Hall, and other American manufacturers. Yetthe workmanship of Hirschmann, of Berlin, and Stoh-rer, of Dresden, has surpassed that of our own mechani-cians. The most complete arrangement of apparat
Electro-therapeutics: a condensed manual of medical electricity . eye and ear twenty are quite enough. Hospitals anddispensaries should be provided with sixty cells ; theInfirmary for the Paralyzed and Epileptic, in London,has one hundred. Solidity of construction is a great desideratum, andseems well attained in the batteries furnished by Dres-cher, Kidder, the Galvano-Faradic Company, Curt , Hall, and other American manufacturers. Yetthe workmanship of Hirschmann, of Berlin, and Stoh-rer, of Dresden, has surpassed that of our own mechani-cians. The most complete arrangement of apparatus isthat of Brenner, containing, in addition to the ordinaryapparatus, two arrangements for the automatic inter-ruption of the galvanic current, besides a rheostat. Whatever arrangement is adopted for increasing anddiminishing the number of cells in use, it is of essentialimportance that no break should occur in the process. Abattery should be tested by the galvanoscope; its polesbeing connected with the latter instrument, the current 166 o £« o APPARATUS. 167 from one cell should be introduced, then that from two,three, and so on ; this should be done gradually, whilethe needle of the galvanoscope is carefully watched tosee if at any point in the ascending scale of strength thecurrent is suddenly interrupted. A defect in the mech-anism of the switch-board or current-selector, asit is variously called, is a fault not to be excused. Ifwe happened to be using, for example, the current fromten cells, and desired to increase the strength to eleven,it might occasion a most disagreeable shock to the pa-tient if an unexpected break in the current should oc-cur in the transit. The galvanoscope, consisting of a compass-needleswinging in the centre of a fine coil of wire, is made ofvarious degrees of delicacy. It furnishes a very con-venient means of deciding, at any moment, whether thecurrent we suppose we are using is actually present, andif so, in which direc
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