. The American encyclopædia of commerce, manufactures, commercial law, and finance. e of communicating betweenthe positive and negative points, will receive thecharge thus to be obtained. It is known that whenwe establish a metallic communication betweentwo bodies charged with equivalent quantities ofpositive and negative electricities respectively,these combine and neutralize each other, and allsigns of electricity vanish. It is obvious that thecontact of the two wires has this effect, as thesigns of electric charge which were before discov-erable in each of the plates are no longer foundwhil
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. The American encyclopædia of commerce, manufactures, commercial law, and finance. e of communicating betweenthe positive and negative points, will receive thecharge thus to be obtained. It is known that whenwe establish a metallic communication betweentwo bodies charged with equivalent quantities ofpositive and negative electricities respectively, these combine and neutralize each other, and allsigns of electricity vanish. It is obvious that thecontact of the two wires has this effect, as thesigns of electric charge which were before discov-erable in each of the plates are no longer foundwhile the wires are in contact. But the chargesreappear the instant the contact is broken, thechemical action ceasing at the same time. Thearrangement of metals and acid which we havedescribed is termed a i/idr.anic (or voltaic) cok/iIp, element, ore//: and a series of cells joined together, as in Fig. 218, is a (jali-anic kitlenj. A single cellis, however, commonly termed balteri/, while theterm rompound hnileri/ is given to a series of cells.See Electko-Metallurgy, Telegr.pii, etc.. Fig. 219. — Groves Battery. Grorrs Bnllfn/ (Fig. 2191 is the most energetic battery yetknown, and is the one mo«)t generally used (or the magnetictelegniptl. Tlie metjils employed arc platinum and zinc, andthe solutions arc strong nitric acid in contact with the plati-num, and sulphuric acid diluted with ten or twelve parts ofwater in contact with the zinc. This battery must be usedwith great care, on account of the strength of the acids usedfor the solutions, which send out injurious fumes, whichare destructive to organic substances. The containing vessel, A, is glass; within this is a thiclt cylinder of amalgamated zinc, Z, standing on short legs, and divided by a longitudinal open-ing on one side, in order to allow the acid to circulate freely.Inside of this is a porous cell of unglazed porcelain, V, con-taining the nitric acid and strip of platinum. The plati-num (shown separately in P) is fixed t