154 Dr. B. Hodgson on the Temperature of the 



dioxide. In the tables, i is the current in amps., and T the 

 excess temperature of the cathode above air temperature. 



Table I. — Air. 



Pressure = 2' 8 mm. 



1 



1 L 



i 



T (°C). 



1 



i 0-00084 



5-07 



000127 



9-35 



00200 



14-10 



00230 



16-45 



00282 



19-35 



0-00295- 



20-10 



Table III. — Air. 

 Pressure = 0'41 mm. 



*. 



T (°0.). 



U0015 



0-80 



0-00090 



6-15 



0-00180 



11-35 



0-00195 



13-30 



0-00220 



14-85 



0-00230 



16-00 



0-00265 



18-00 



Table V. — Oxygen. 



Pressure = 



= 3' 7 mm. 



i. 



T (°C). 



000080 



6-40 



000127 



10-10 



0-00175 



13-40 



0-00220 



17-05 



000245 



18-80 



00250 



19-50 



Table VII 

 Pressure = 



— Oxygen. 

 0-57 mm. 



i. 



T (°C). 



000057 

 000120 

 0-00185 

 000225 

 000280 



3-9 



8-8 



131 



162 



20-2 



Table II.— Air. 

 Pressure = 1*0 mm. 



i. 



T (°C). 



0-00067 



5-05 



0-00119 



805 



0-00155 



10-20 



000194 



13-30 



0-00220 



15-75 



0-00280 



19-20 



1 



Table IV.— Air. 

 Pressure = 0*17 mm. 



Table VI. — Oxygen. 

 Pressure = 1*65 mm. 



Table VIII. — Oxygen, 

 Pressure = 0*20 mm. 



i. 



T. (°C). 



000043 



310 



0-00058 



4-85 



00082 



6-65 



0-00115 



9-45 



0-00183 



16-30 



0-00187 



15-55 



0-00210 



1955 



i. 



T (°C). 



0-00085 

 000155 

 0-00215 

 0-00265 



6-70 

 11-10 

 15-75 

 19-15 



i. 



T (°C). 



0-00060 

 000125 

 0-00180 

 000220 

 0-00230 



4-8 

 10-2 

 150 

 18-8 

 19 55 



