[DAWES] SPECIFIC HEAT OF A GAS AT CONSTANT PRESSURE 195 



TABLE I— {Continued.) 



The first of these curves (A) shews that after the first few minutes 

 the temperature became steady and remained so during the experiment. 

 The scond and third (B and C), shew respectively that the air flowed 

 through the calorimeter uniformly, and that the heat was communicated 

 to it at a uniform rate. 



The determination of the value of the specific heat at constant 

 pressure for air from this set of readings is summed up in the following : 



Denoting the rate of motion of the calorimeter thread when the air 

 was flowing through the coil by A, and when it was issuing from the 

 outlet b by B, the results obtained were as follows: — 



Average value of A ^ 6.612 divisions per minute. 

 Temperature fall between terminals of thermocouple = 21.9° 

 Average value of B = 4.982 divisions per minute. 

 Temperature fall = 21.8° 



Reduced value of B corresponding to temperature fall of 21.9° = 5.0071 

 divisions per minute. 



