442 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Duration of run : 6 hrs. 

 Power : 11.7 K. W. 

 Temperature : 1465° C. 



Initial weight bulbs 182.5989 grams 



Final " " 182.6061 " 



Gain 0.0072 " 



Time taken for absorption 4£ hours. 



jt?i = 67.2 cm. of mercury 

 p 2 =38.1 " " 

 p s = 91.8 " " 



.000589 X .0821 X 288 X 760 X 91.8 „ 

 •*^CO = - 19.9 X 67.2 -=0.73 mm. 



On opening the furnace somewhat more white powder found on the 

 walls than in Experiment 1. 



This experiment was carried out with the idea of approaching the 

 equilibrium from the side which generates carbon monoxide. To decide 

 whether this had been done in the above experiment it was necessary 

 to see whether the bulbs would gain no weight if the furnace were filled 

 with hydrogen and part then drawn through the bulbs. The following 

 blank experiment was therefore carried out. The furnace was evacu- 

 ated to a pressure of 0.15 centimeter of mercury, hydrogen was let in 

 to 1 centimeter and again evacuated to 0.15. This operation was re- 

 peated and hydrogen then let in to 67.6 centimeters. The final filling 

 took 1 hr. 40 min. 



The gas then drawn through the weighed bulbs for 3 hrs. 45 min. 



pi = 67.1 cm. of mercury 

 p 2 = 38.1 " " 



Initial weight reduced 182.606 grams 



Final " " 182.627 " 



Gain 0.021 " 



If the whole amount of gas could have been drawn through the gain in 

 weight would have been 0.049 gram. This gain in weight must have 

 been due to oxygen, which might not have been removed or which 

 might have gotten in while filling the furnace. This would have been 

 converted to carbon monoxide by the hot carbon spiral giving too high 

 a pressure for equilibrium. Equilibrium in Experiment 2 was therefore 



