444 PKOCEEDINGS OF THE AMERICAN ACADEMY. 



Power : 8.8 K. W. 



Temperature : 1270° 



Duration of run : 7 hrs. 10 min. 



The absorption bulbs were refilled. 



Initial weight 182.9303 grams 



Final " 182.9316 " 



Gain 0.0013 " 



px = 66.8 cm. of mercury 

 ^ 2 = 37.2 " " 

 ^3 = 90.3 " " 



0.000103 X .0821 X 285 x 760 X 90.3 n , 

 ■'•^CO = - 19.9 X 66.8 "=0.13 mm. 



Experiment 5. 



The object of the following experiment was to see if measurements 

 might not be carried out at a somewhat higher temperature where 

 the pressure would be greater and the determination therefore more 

 accurate. 



The charge was the same carbide used in experiment 4 to which 

 about one half as much lime and carbon, previously heated to redness, 

 was added. The furnace was then evacuated to 0.2 centimeter and 

 heated to 900° for 1^ hours. It was then evacuated to 0.2 centimeter 

 and hydrogen let in to 2.3 ; again evacuated to 0.12 centimeter and 

 filled with hydrogen to 67.7. 



The charge was then heated 7 hours with 10.0 kilowatts, correspond- 

 ing to 1370°. This must have established equilibrium at this tem- 

 perature. The power was then raised to 12.6 kilowatts corresponding 

 to 1525° for 4^ hours. 



The cuprous chloride was the same used in Experiment 4. 



Initial weight 182.9243 grams 



Final " 182.9277 " 



Gain 0.0034 " 



Time taken for absorption 3 hrs. 



^ = 66.3 cm. of mercury 



jr, 2 =37.7 " " 



^ 3 =90.0 " " 



