260 PROCEEDINGS OF THE AMERICAN ACADEMY, 



Current in 

 Time. Kilowatts. Pressure. Wanner Temperatvire. 



Pyrometer. 



July 8. 8.05 A. M. 0. 167.5 . . 25 



8.10 " 4.96 199.7 



10.00 " 4.98 120.7 



Some nitrogen pumped out, so as to reach equilibrium sooner. 



10.03 A. M. 5.02 108.0 

 11.00 " 4.98 98.5 



More nitrogen pumped out. 



11.05 A.M. 5.01 93.8 



2.00 p.m. 5.00 86.3 6.02 1110 



More nitrogen pumped out. 



2.05 p.m. 5.01 83.2 



2.30 " 4.98 83.0 



The pressure remained constant, and was then reduced to 73.4 and 

 then to 70 and remained constant at both values. It was then re- 

 duced still more. 



45.2 



48.0 

 July 9. 8.10 A. M. 5.00 35.3 



47.8 



50.9 6.05 1107 



51.1 



51.3 



At a pressure of 86.3 millimeters, nitrogen was being slowly ab- 

 sorbed, and at 51.3 the pressure had become constant starting with a 

 lower value. The mean of these is 68.3 millimeters, and the mean 

 temperature was 1114°. No good reason why the velocity of the re- 

 action was so slow in this case can be given. 



Experiment 15. 

 c 



Pyrometer. 



Current in 

 Time. Kilowatts. Pressure. Wanner Temperature. 



July IS. 8.45 a.m. 0. 318.6 



8.50 " 10.9 415. 



9.30 " 10.9 428.5 6.1 1441 



10.00 " 10.9 429.5 



It seemed that not enough nitrogen had been let into the furnace to 

 start with, so more was admitted. 



