. The Philosophical magazine; a journal of theoretical, experimental and applied physics. wenty-ninth Meeting of the IJritish Association,Aberdeen, 1859, Trans, of Sections, p. 20), and which he seemsto attribute to entirely different causes. In the report of Prof. Tlionisons communication (o the Bri-tish Association here referred to, it is staled that (after menti()n-ing certain experiments by Mr. F. Jenkin on submarine cablescoiled in the manufactory of Messrs. Newall and Co., Birkenhead,in which owv. end of the battery used, and one end of the cableexperiinentcd on, in each casewas kept in
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. wenty-ninth Meeting of the IJritish Association,Aberdeen, 1859, Trans, of Sections, p. 20), and which he seemsto attribute to entirely different causes. In the report of Prof. Tlionisons communication (o the Bri-tish Association here referred to, it is staled that (after menti()n-ing certain experiments by Mr. F. Jenkin on submarine cablescoiled in the manufactory of Messrs. Newall and Co., Birkenhead,in which owv. end of the battery used, and one end of the cableexperiinentcd on, in each casewas kept in connexion with tiie earthwhde the other (;nd of the cable, after having been for a time in * Iliil. Mii|j;. .lamiiiiy IsCI. t Comiimiiiciitctl by the Autliors. False Discharge of a Coiled Electric Cable. 203 connexion with the insulated pole of the battery, was suddenlyremoved from the battery and put in conncxiou with the earththrough the coil of a galvanometer) Prof. Thomsou aud ^ Jeukin remarked that the detlectious recorded in these Fig. used by Mr. B. Battery. C. Cable. E„ E-i, E;j. , b, c. Three teriuinab of key d. experiments were in the contrary direction to that which the truedischarge of the cable would give; and at Prof. Thomsonsrequest Mr. Jenkin repeated the experiments, watching care-fully for indications of reverse currents to those previously was thus found that the first eflfect of pressing down the key[to throw the cable from battery to earth through galvano-meter] was to give the galvanometer a deflection in the directioncorresponding to the true discharge current, and that this wasquickly followed by a reverse current generally greater in degree,which gave a detiectiou corresponding to a current in the samedirection as that of the original tiuw through the cable. Professor Thomson explained this second current, or falsedischarge, as it has since been sometimes called, by attributingit to mutu
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