W. G. Mixter — Thermal Constants of Acetylene. 17 



Experiment 5,— Gas, 569*3 CC at 20*9° and 760*8 mm pressure ; 

 gas, 98*1 per cent acetylene ; weight of acetylene, 0*6069 

 gram ; water and water equivalent of calorimeter, 31 13*1 

 grams ; oxygen, 3*1 grams. 



Temperature interval. 



Minutes. • 



Temperature. 







20-372 



1 



20 373 



2 



225 



3 



22-6 



4 



22-701 



5 



22-701 



6 



22-701 



7 



22-699 



8 



22-698 



9 



22-696 



10 



22-695 



22-701 — 20-273 + 0-006 = 2'334° 



Observed heat, 3113-1 X 2*334 — 7266 c 



From these data we have for the 

 value of Q = 312895 c . 



Experiment 6. — Gas, 569-6 ec at 20-5° and 757*8 mm pressure ; 

 gas, 98*5 per cent acetylene ; weight of acetylene, 0*6084 gram ; 

 water and water equivalent of calorimeter, 3231*3 grams ; 

 oxygen, 3*4 grams. 



Minutes. 







1 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 

 13 



Temperature. 

 19*348 

 19-349 

 19350 

 21-5 

 2157 

 21-599 

 21-599 

 21-597 

 21-593 

 21-591 

 21-588 

 21-587 

 21-585 

 21-583 



Temperature interval. 



21-597-19-35 + 0-01 = 2*257' 



Observed heat, 3231*3X2*257 = 7293 ( 



Q = 313401' 



The. results are as follows : 



No. of Exp. 

 4 

 5 

 6 



Average 



Calories 

 312269 

 312895 

 313401 

 312855 



This is for the heat of combustion of 26*016 grams of acety- 

 lene at constant pressure at 0°, and at 18° it is 312677. The 

 results of the earlier work reduced by Professor Bumstead's 



Am. Jour. Sci.— Fourth Series, Vol. XXII, No. 127.— July, 1906. 



