The outlines of physics: an elementary text-book . Fig. From a photograph taken by R. W. Quick. 264 THE OUTLINES OF PHYSICS CHAPTER XXVI THE ELECTRIC CURRENT SijH ?^ +. 231. Electrification by Chemical Action. — Thus far we have considered the electrification of bodies by friction. Itis also possible to electrify two metals,oppositely, by chemical action. It ist! usual to speak of two conductorsthus electrified as possessing a differ-ence of potential.^ If a piece of zincand a piece of copper, for example,be placed in a glass (Fig. 227) con-taining an acid, such as dilute sul-phuric acid
The outlines of physics: an elementary text-book . Fig. From a photograph taken by R. W. Quick. 264 THE OUTLINES OF PHYSICS CHAPTER XXVI THE ELECTRIC CURRENT SijH ?^ +. 231. Electrification by Chemical Action. — Thus far we have considered the electrification of bodies by friction. Itis also possible to electrify two metals,oppositely, by chemical action. It ist! usual to speak of two conductorsthus electrified as possessing a differ-ence of potential.^ If a piece of zincand a piece of copper, for example,be placed in a glass (Fig. 227) con-taining an acid, such as dilute sul-phuric acid, the copper will becomepositively, and the zinc negatively,electrified. Such an arrangement iscalled a voltaic cell? The source of electrical energy, in this case, is the chemical reaction between the zinc and the acid. This difference of potential is so small that it can scarcely be shown by means of an ordinary electroscope. With the quadrant electrometer described in a previous 1 The term difference of potential is frequently iised in speaking ofthe difEerence of electrical condition of bodies, however electrified. If apositively and negatively charged conductor
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