290 



Mr Richardson, On the Negative Radiation 



those for higher temperatures. The accompanying table gives 

 a series of observations of the temperature and the current, the 

 results of which are plotted in Diagram I. 



Negative 



Potential 



of hot wire 



in volts 



Pressure of 

 gas in mm. 

 of mercury 



Eesistance of hot 

 wire in ohms 



Current 



from wire to 



cylinder in 



amperes x 10~ 9 



Temperature 



OF WIRE 



in degrees 

 centigrade 



123 



•023 



(1) 8-338 



(2) 8-335 



2-52 



1031 



121 



•025 



(1) 8-438 



(2) 8-430 



8-28 



1058 



120 



•021 



(1) 8-642 



(2) 8-625 



30-6 



1105 



120 



•025 



(1) 8-795 



(2) 8-782 



100-5 



1146 



120 



•024 



(1) 8-894 



(2) 8-875 



188 



1170 



120 



•028 



(1) 8-969 



(2) 8-950 



300 



1190 



120 



•028 



(1) 9-106 



(2) 9-088 



728 



1224 



120 



•032 



(1) 9-163 



(2) 9-131 



858 



1243 



120 



•032 



(1) 9-263 



(2) 9-230 



1414 



1269 



120 



•037 



(1) 9-381 



(2) 9-350 



2600 



1298 



120 



•044 



(1) 9-472 



(2) 9-445 



4025 



1323 



120 



•063 



(1) 9-603 



(2) 9-574 



11,320' 



1354 



120 



•063 



(1) 9-925 



(2) 9-883 



16,740' 



1445 



1 The current began to be very unsteady here. 



