. The Philosophical magazine; a journal of theoretical, experimental and applied physics. g, and which, under carefultests, never gave the slightest indication of false discharge,although, even when the remote end had completely lost insula-tion, they gave not only polarization effects*, but also, in the samedirection as these, but distinguishable from them, indications oftrue discharge. But, in fact, a fortnight before the theoreticalconclusion was published by Prof. Thomson at the Aberdeenmeeting, a most remarkable and decisive experimental demon-stration of it was published by Mr. Webb, Eng
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. g, and which, under carefultests, never gave the slightest indication of false discharge,although, even when the remote end had completely lost insula-tion, they gave not only polarization effects*, but also, in the samedirection as these, but distinguishable from them, indications oftrue discharge. But, in fact, a fortnight before the theoreticalconclusion was published by Prof. Thomson at the Aberdeenmeeting, a most remarkable and decisive experimental demon-stration of it was published by Mr. Webb, Engineer to the Elec-tric and International Telegraph Company, who had indepen-dently discovered the phenomena which form the subject ofthis paper, and given substantially the same explanation as thatwhich we now maintain. If there could be a doubt as to theelectro-magnetic theory, the following extract from a letter ofMr. Webbs, published in The Engineer of August 20, 1859,is decisive:— It is, however, on making contact at F with earth [that is to Y^?;. used hy Mr. I]( C. Ik Ray, putting what we have called the near end of the cable toearth] that the greatest and most singular difrerencc occurs [be-tween sfraiglit and coiled cables]. It will then be seen that theneedle at A [that is to say, tlu; needle of a galvanometer in eir-niit between key and cable instead of between key and earth, asin oiir experiments], instead of being reversed will continui; ? Of the sniTH iintiin- ns fliosc {ihscrvcd liy Pnif. Wliciitstoiu on liissliort, cnhlcH. Mr. J. A. Wanklyn (jh the Movements of Gases. 211 deflected in the original direction, and both needles will verygradually resume the perpendicular/ There is a most marked difference between the effect producedbetween a coiled and a straight cable. The return current ap-pears obliterated, or rather it is overpowered by the effects of theinductive action which takes place from coil to coil. The deflec-ti
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