. The Philosophical magazine; a journal of theoretical, experimental and applied physics . pressure of gas the current does not subdivide itself be-tween the two in any definite ratio to the resistances of the tubes, butthe one tube remains entirely dark, the current goes altogether throughthe other. The law according to which currents divide when the discharge takesplace in gas must therefore be investigated empirically in the fust take this opportunity of remarking that I have made an erroneousassumption on this subject in a series of experiments in my book pre-viously referred to, w
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . pressure of gas the current does not subdivide itself be-tween the two in any definite ratio to the resistances of the tubes, butthe one tube remains entirely dark, the current goes altogether throughthe other. The law according to which currents divide when the discharge takesplace in gas must therefore be investigated empirically in the fust take this opportunity of remarking that I have made an erroneousassumption on this subject in a series of experiments in my book pre-viously referred to, which, however, does not actually afiect the resultobtained. I believed myself justified in assuming as the evidence ofcertain phenomena (p. 140), that if a part of the discharge traverse a me-tallic circuit from the kathode a to an electrode b, and then the resistanceof a moistened thread be introduced between b and a wire c, that then the Discliavge in Rarefied Gases. 371 One of the experimental tubes is represented in fig. cjlindrical tube is ])rovided with a flat kathode placed. at right angles to the axis of the tube, and nearly as largeas the section of the tube. The anode is placed close infront of it, or in other cases consists of a verj short wirein the plane of the kathode itself. Inside the cylinder isa movable partition c, consisting of a short glass cylinder ter-minated by a plane surface at the end turned towards thekathode. In accordance Avith what I have noted on formeroccasions*, the positive light disappears for such an arrange-ment of the electrodes when the exhaustion has reached acertain limit, or it is confined to the immediate neighbourhoodof the anode ; the kathode-light, on the other hand, expandsto any extent if the exhaustion is sufficient, and the expansionof its rays is limited only by their striking upon a solid , when a sufficient exhaustion has been reached, we canvary the expansion of the kathode-rays within wide limits bysliding th
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