The London, Edinburgh and Dublin philosophical magazine and journal of science . t Phil. Mag. [5] xxix. pp. 358, 441. X Phil. Trans, cxcvii. p. 415 (1901). § Guthrie, Phil. Mag. [4] xlvi. p. 257 (1873). || Wied. Ann. xxxviii. p. 27 (1889). U Phil. Mag. [5] xliv. p. 203 (1897).** Proc. Camb. Phil. Soc. x. p. 241 (1900), and xi. p. 296 (1901).ft Ibid. xi. p. 286 (1901).XX Phys. Eev. xiii. p. 321 (1901).§§ Wied. Ann. xxi. p. 90 (1884)., On the Discharge of Electricity through Gases. G85 was attained, after which it began to diminish rapidly. Thedifferences were more marked at reduced press
The London, Edinburgh and Dublin philosophical magazine and journal of science . t Phil. Mag. [5] xxix. pp. 358, 441. X Phil. Trans, cxcvii. p. 415 (1901). § Guthrie, Phil. Mag. [4] xlvi. p. 257 (1873). || Wied. Ann. xxxviii. p. 27 (1889). U Phil. Mag. [5] xliv. p. 203 (1897).** Proc. Camb. Phil. Soc. x. p. 241 (1900), and xi. p. 296 (1901).ft Ibid. xi. p. 286 (1901).XX Phys. Eev. xiii. p. 321 (1901).§§ Wied. Ann. xxi. p. 90 (1884)., On the Discharge of Electricity through Gases. G85 was attained, after which it began to diminish rapidly. Thedifferences were more marked at reduced pressures. Hittorfalso found that the potential gradient in the positive columnwas independent of the current, but diminished with thepressure. The cathode fall remained practically constantuntil the cathode was covered with the negative glow, afterwhich it increased with increasing current. It also increasedvery rapidly with diminishing pressure. Apparatus. The form of vacuum-tube used in the present series ofexperiments is shown in the diagram (fig. 1). The electrode Ficr. To TopteffPt/MP. (KK) consisted of a platinum wire bent backwards and for-wards on itself so as to form a plane grating. Four strandsof wire of the same thickness fused into each of two side 6S6 Mr. J. A. Cunningham on the tubes served to lead the heating current through the gratingwithout undue heating of the blue-glass joint. The grating-could thus be included in the circuit of a carefully insulatedsecondary wound on a ring transformer. The current forthe primary was taken from the Cambridge town (alternating)supply, and was regulated by means of a rheostat. The opposite electrode (A) was made of a similar grating,but could not be artificially heated. The three intermellTateelectrodes (E, D, & B) were made of fine platinum wireswhose free ends inside the discharge-tube were hammeredout flat, and the edges then trimmed off parallel, so that thewidth of the blade was only about double the diameter of theo
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