The London, Edinburgh and Dublin philosophical magazine and journal of science . A disk-electrodeA, of aluminium, was inlaid in guttapercha. The drop atthis could be obtained by means of an adjustable wire ponderous magnet being used, the tube was provided witha ground-joint T, so that without shifting it the electrodecould be rotated to any desired direction with respect to thatof the magnetic field. At the Cathode,—In Table III. the effect of the field onthe cathode drop (the between the cathode and the nega-tive glow) is given, and the results plotted in fig. 8 (p. 502).They are in
The London, Edinburgh and Dublin philosophical magazine and journal of science . A disk-electrodeA, of aluminium, was inlaid in guttapercha. The drop atthis could be obtained by means of an adjustable wire ponderous magnet being used, the tube was provided witha ground-joint T, so that without shifting it the electrodecould be rotated to any desired direction with respect to thatof the magnetic field. At the Cathode,—In Table III. the effect of the field onthe cathode drop (the between the cathode and the nega-tive glow) is given, and the results plotted in fig. 8 (p. 502).They are independent of the direction of the field, and weretaken at those pressures at which the field appears to have noinfluence on the distribution of current at the cathode. Ata pressure of 1*8 mm. a field of 760 lines per sq. cm, pro-duces an inappreciable effect; at 0*5 mm. a field of 650 linesreduces the drop about 8 volts : at 0*2 mm., 20 volts : at amuch lower pressure about 200 volts. The decrease seems Potential at tlte Electrodes in Vacuum-tube Discharge. 501 Vvi. 7. * X. Table III.—Effect of a Magnetic Field on Cathode Dropat various Gas-Pressures. Gas- npressure >in mm. I 18 ! ^nt Without (milh; Field,amps.). 0-201-00 1-50 1-8U 2-00 With ? lines, WithoutField. 296 2:30 220 230 2-50 232 300 240 4-00 252 229 238 281)286 360 35: 02 Yerv \o\ Without JJIJS Without 5™Jtj-u Field. —. ,-, iield. FieR 6501. Flelcl 4201. 355 500 574567 468 544 538* * At this pressure the gas deteriorates with currents of the given magnitude more or less rapidly. 502 Prof, Skinner on Conditions controlling the Drop of very nearly independent of the current, a comparatively?slight increase with current being registered. Fig. 8. i / \r ?- ofl /. \ / / Soc / / 4* / i / 1 £ ? -joo 1- S 0 \/ / j i fry ^ / t /fl h Ii / y, i r /.* i i———? ?_ - ™ —j 1 •.©#7 2 oo /.00 ClL *renl 1 & UlU- t. AW/! *; - *• >o Owing to the limited battery available the observ
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
