The London, Edinburgh and Dublin philosophical magazine and journal of science . er cm. This velocityis very large compared with the velocity of ions through anelectrolyte ; it is, however, small compared with the velocitywith which an atom carrying an atomic charge would movethrough a gas at atmospheric pressure; if we calculate bythe kinetic theory of gases this velocity, we find that for airit is of the order 50 ; this result seems to imply thatthe charged particles in the gas exposed-to the Rontgen raysare the centres of an aggregation of a considerable number ofmolecules. The relat
The London, Edinburgh and Dublin philosophical magazine and journal of science . er cm. This velocityis very large compared with the velocity of ions through anelectrolyte ; it is, however, small compared with the velocitywith which an atom carrying an atomic charge would movethrough a gas at atmospheric pressure; if we calculate bythe kinetic theory of gases this velocity, we find that for airit is of the order 50 ; this result seems to imply thatthe charged particles in the gas exposed-to the Rontgen raysare the centres of an aggregation of a considerable number ofmolecules. The relation between the current and electromotive forcegiven by equation (4) corresponds to that obtained by experi-ment for a number of gases ; it does not, however, exhibit apeculiarity which we hase sometimes observed, especiallywhen the radiation was strong, i. <?., the existence of a part ofthe curve where the current increases faster than would bethe case if Ohms law were true ; this is shown by the portionEF of the curve in fig. 2, which represents the relation be- Fiff. tween the current and electromotive force through sul-phuretted hydrogen. When the intensity of the Rontgenravs is altered, the alteration in the current is not the same of Electricity through Gases exposed to Rontgen Rays. 403 at different points in the curve. When the intensity of theserays is diminished} the saturation current is diminished in alarger proportion than the current for small electromotiveforces. This is shown by the following diagram, whichrepresents the i and E curves through chlorine gas for dif-ferent intensities of the Rontgen rays ; the weak radiation wasgot by interposing a thick aluminium plate. In this diagram Fijr. 3.
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