Discharge of Electricity through Gases. 



689 



their corresponding temperatures. As in all recorded cases, 

 the potential indicated on the voltmeter was changing but 

 slowly, and as the coil of the d'Arsonval galvanometer was 

 inclosed in a silver cylinder and was very dead beat, it was 

 thought that the error of observation could not really be very 

 great. Some such lag is, after all, only to be expected. 



Results. 

 In Tables I. to VIII. are shown the measurements of the 

 fall of potential along the discharge at different pressures, 

 the temperature of the cathode being kept constant. 



Table I. 



Temperature 





Potential Difference, 





of Cathode. 







Volts. 



Pressure, 



Deflex- 









1 





Mercury. 



ion. 



°C. 



K-A. 



K-E. 



E-A. ! K-D. 



K-B. 





0-90 



35 



815 



300 



(515.) | ... 



665 



118 



0-90 



35 



780 



240 



(540) i ... 



520 



' 0-88 



090 



35 



720 



214 



(508) : ... 



500 



0-66 



0-90 



35 



650 



228 



(422) 1 ... 



396 



051 



0-95 



38 



600 



259 



(341) 



345 



0-38 



090 



35 



538 



320 



218 



340 



(350) 



i 029 



090 



35 



522 



352 



170 







0221 



0-90 



35 



519 



370 



149 







I 0168 



0(55 



27 



558 



395 



163 







: o-io5 



0-90 



35 



580 



418 



162 







! 0-104 



090 



35 



654 



478 



176 





0079 



095 



38 



705 



503 



202 





0050 



0-95 



38 



1100 



770 



>310 





0031 



i 









Table II. 









Temp, of 

 Cathode. 



Potential Difference. 



Current. 



Pressure, 

 . mm. of 

 ' Hg. 

















Defln. 



°C. 



K-A. 



K-E. 



E-A. 



Defln. 



Amp. x 10 5 





32-8 



820 



1150 



293 



860 



660 



396 



2-67 



33-3 



832 



960 



268 



680 



7-40 



4-44 



1-92 



33-3 



832 



800 



292 



512 



8-35 



501 



1-42 



333 



832 



755 



290 



(465) 



(8-6) 



(516) 



i 103 



333 



832 



730 



293 



(437) 



90 



5-40 



076 



333 



832 



660 



230? 



(430) 



9-15 



5-49 



0563 



333 



832 



625 



290 



(335) 



... 





0-507 



1 33-3 



832 



580 



387 



181 



9-25 



5 •.">."> 



0-294 



■ 33-3 



832 



625 



430 



190 



9-65 



5-79 



0210 



33-3 



832 



650 



465 



192 



8-45 



5-07 



0-155 



333 



832 



7J0 



537 



197 



7-95 



4-77 



0-108 



333 



832 



690 



482 



212 



7-85 



471 



0-079 



33-3 



832 



730 



520 



255 



7-40 



4-44 



0-058 







840 



527 



313 



6*55 



3-93 



0041 



333 



832 



107(» 



540 



(530) 







0-029 



Phil Mag. S. 6. Vol. 4. No. 24. Dec. 1902. 



2Z 



