. The London, Edinburgh and Dublin philosophical magazine and journal of science. gas was hydrogen,and the inner electrode was a brass tube 8 mm. in inner electrode was positive for A and B, negative for 482 Mr. A. B. Meservey on the Potentials required A andB. The dotted lines show the corresponding parallelplate curves, calculated in accordance with Paschens law Vai&i__ Fig. 2. ! /A 1 *f V— T 9 J / i 0 / / / r / / / / / ■ 1 %r f 1I ! / / 11 / / .., I / II / „y / \ 1 w / » j 1 ;/ \ «V* * «Jt / \^£ ,^ ^ V1* V ^j ^ J^ -««. — € 9 v^S Vr, S3W1 ■« hi f w >• L 1. 6 from the expe
. The London, Edinburgh and Dublin philosophical magazine and journal of science. gas was hydrogen,and the inner electrode was a brass tube 8 mm. in inner electrode was positive for A and B, negative for 482 Mr. A. B. Meservey on the Potentials required A andB. The dotted lines show the corresponding parallelplate curves, calculated in accordance with Paschens law Vai&i__ Fig. 2. ! /A 1 *f V— T 9 J / i 0 / / / r / / / / / ■ 1 %r f 1I ! / / 11 / / .., I / II / „y / \ 1 w / » j 1 ;/ \ «V* * «Jt / \^£ ,^ ^ V1* V ^j ^ J^ -««. — € 9 v^S Vr, S3W1 ■« hi f w >• L 1. 6 from the experimental curves of Prof. Townsend *. Fig. 3shows the curves obtained for three of the seven diametersused in air ; fig. 4 those for three of the five diameters used in * The Theory of the Ionization of Gases by Collision/ p. 60. to produce Discharges in Gases at Low Pressures. 483 hydrogen. The others have been omitted in order to avoidmaking the diagram too complicated. For all the carves,the inner diameter o£ the outer cylinder was 39*6 mm. Fia:. ,tj r% tfC fr^t h*f f^£ fi% In fig. 3, curves A and A , diameter of inner cylinder was *2 t, v » BandB, „ „ „ C and C, In fig. 4, curves A and A, „ „ „ BandB, „ ,, „ CandC, „ 3-23 . „ 15*95 , •25 , „ 5-10 , „ 1595 , 484 Mr. A. B. Meservey on the Potentials required A few sets of readings were taken with aluminium andplatinum electrodes inside, but they showed no consistentdifferences from those obtained with brass. It seemed as ifthere might be some effect due to difference of material, butif so, it was different in air from what it was in hydrogen. Fig. 4.
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