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 
Resistance 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. 
