. The Pharmaceutical era. he case. (Fig. 110.)When the crank is tiirniNl acurrent is produced which ringsa bell both at the transmittingand receiving instrument. Whenthe receiver which hangs at theside is removed from the hookthe latter rises, and in so doingthrows the dynamo out of thecircuit, and closes the circuitwhich includes the local bat-tery, the receiver and the trans-mitter. As in the telegraph theground connection serves as thereturn circuit. iFig. 111.) Medical and Surgical Uses.—Phar-macists are frequently calledupon to supply batteries intend-ed for the application of theelectric
. The Pharmaceutical era. he case. (Fig. 110.)When the crank is tiirniNl acurrent is produced which ringsa bell both at the transmittingand receiving instrument. Whenthe receiver which hangs at theside is removed from the hookthe latter rises, and in so doingthrows the dynamo out of thecircuit, and closes the circuitwhich includes the local bat-tery, the receiver and the trans-mitter. As in the telegraph theground connection serves as thereturn circuit. iFig. 111.) Medical and Surgical Uses.—Phar-macists are frequently calledupon to supply batteries intend-ed for the application of theelectric current for medical pur-poses. While there are manyvarieties of these, the principleof construction is essentiallythe same in all, the differencesconsisting mainly in matters of detail. They include,first of all, one or more galvanic cells, usually of theGrenet type, in which the plates are respectively of car-bon and zinc, and the exciting, and depolarizing fluid asoluton of potassium dichromate and sulfuric acid, the. Fig. 110.—ModernTelephone. December 9, 1897.] THE PHARMACEUTICAL ERA. 875 current thus produecil sorviiiR as the primary current ofnr, induction coil. Tlic secondary current because of itsgreater intensity is tlie one applied. Commonly of varyin«r the intensity is added, as by introduc-
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
