190 



Dr. B. Hodgson on Heating Effects at 



0*18 mm. of mercury. The quantities given yield ergs if 

 multiplied by 10 4 . 



Table I. 



i amps. 



•001 



•002 



•003 



•004 



•005 



•006 



•007 



Pressure 















mm. 

















3-8 





75 



99 



124 



146 



197 



222 



3-08 





75 



110 



132 



163 







225 



35 



73 



102 



131 



172 



211 





1-5 



70 



138 



194 



258 



312 



362 



402 



1-33 



69 



128 



186 



248 



299 



346 



399 



1-21 



66 



120 



181 



234 



289 



349 



418 



110 



63 



115 



154 



217 



272 



321 



364 



1-00 



63 



110 



166 



200 



266 



311 



356 



0-81 



56 



102 



152 



199 



249 



289 



348 



0-60 



49 



96 



135 



190 



220 



260 



281 



0-50 



48 



90 



119 



150 



145 



157 



127 



041 



38 



69 



69 



50 



44 



59 



96 



0-35 



34 



17 



28 



43 



74 



121 



330 



0-28 



12 



21 



61 



196 



576 



— 



— 



0-23 



27 



218 













0-18 



83 















The corresponding values of the potential (V) between 

 the electrodes of the vacuum-tube are given in volts in 

 Table II. 



Table II. 



i amps. 



•001 



•002 



•003 



•004 



•005 



•006 



•007 



Pressure 

















mm. 

















3-8 





565 



515 



502 



490 



490 



510 



3 08 



630 



527 



505 



490 



487 



517 



— 



2-25 



560 



530 



520 



530 



527 



542 



— 



1-5 



660 



655 



660 



650 



650 



652 



640 



1-33 



6+7 



632 



652 



647 



635 



640 



642 



1-21 



620 



627 



632 



647 



650 



647 



650 



1-10 



617 



627 



635 



647 



650 



655 



657 



100 



612 



625 



642 



643 



632 



637 



640 



081 



597 



635 



655 



675 



680 



680 



680 



060 



663 



660 



702 



740 



777 



807 



830 



0-50 



627 



720 



787 



848 



872* 



950* 



980* 



041 



672 



777 



855* 



940* 



10751 



1230t 



1500§ 



0-35 



750 



885 



10001- 



1210t 



1300t 



— 







0-28 



940t 



12(i0t 



1560§ 



2200§ 









0-23 



1700§ 



3100§ 













0-18 



2750§ 















