The nucleation of the uncontaminated atmosphere . (Phil. Trans. Royal Soc. 1897, vol. 189, p. 265), in viewof the differences of the apparatus employed. The reduced fog limitwith the wet-sponge tube may be referable to increased supersatura-tion, but there is probably some specific cause yet to be investigated.*The highest nucleations observed lie within N= 25,000, which is veryfar below the conditions at which axial colors occur. The following chart (figs. 45-51) illustrates tables 29, 32, 33, 34,35, 36. Exp. refers to time of exposure to radiation; 8ft, tolapse of time aft
The nucleation of the uncontaminated atmosphere . (Phil. Trans. Royal Soc. 1897, vol. 189, p. 265), in viewof the differences of the apparatus employed. The reduced fog limitwith the wet-sponge tube may be referable to increased supersatura-tion, but there is probably some specific cause yet to be investigated.*The highest nucleations observed lie within N= 25,000, which is veryfar below the conditions at which axial colors occur. The following chart (figs. 45-51) illustrates tables 29, 32, 33, 34,35, 36. Exp. refers to time of exposure to radiation; 8ft, tolapse of time after radiation ceases. D is the distance of the ionizer(X-ray bulb or radium tube) from the nearer end of the fog chamber. *It will be shown elsewhere that the (very slow) rate of filtration is here essentiallyin question. EFFECT OF X-RAYS. 51 8 p is the pressure difference observed after exhaustion. The ordinatesare often merely distributive or show the number of an observation ina series. The fog chambers are wood or glass as specified, I _ T I. In the above chart the terms tables 2, 5, 6, 7, 8, 9 refer to the tables In text nownumbered 29, 32, 33, 34,35,36. 45. Dust-free air energized by the X-rays from a distance.—In table30 data are given for the case of dust-free air feebly energized by theX-rays, the filter having the same sponge-tube attachment. I wasnot at the time aware of the rapid decay of the nuclei or ions producedby these means, and about one-half minute was allowed to elapse after 52 NUCLEATION OF THE TJNCONTAMINATED ATMOSPHERE. the exposure to the radiation before the observation was taken. Theresulting apertures are thus reduced, about two-thirds of the nuclea-tion having vanished; but they are otherwise comparable and muchsmoother than in the absence of a lapse of time, L, between the endof the exposure and the condensation. Two successive exhaustionsare often made for the same exposure, for which Nr and A^ are thenucleations reduced to air at normal pressure
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