Thermodynamic Properties of Air. 



15 



Minutes. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



H 



10 current on 



1(H 



11 



II*:::::::::::::::::::: 



m 



13 



13/» 10s end of cur 

 13* 



14 



W* 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



Temp, of 

 caloriinet. 



20 954 



868 



781 

 694 



601 

 517 

 420 



329 

 240 

 196 

 152 

 1961 

 18-70 

 1779 

 1695 

 1608 

 15-25 



14-58 

 14-523 

 522 

 520 



510 

 494 

 476 

 460 

 440 

 419 

 400 

 379 

 360 

 341 



Hydrogen 

 thermom. 



10351 



- 10350 



103-50 



103-50 



Galvanom. 

 deflexion 

 millim. 



250-4 



29-6 

 29-7 

 30-7 

 30-2 

 30-4 

 30-3 



1030 



Auxiliary 

 thermometers. 



*= 18-2,*' = 16-4 



t=180, *' = 184 



With the aid of the numbers recorded in the 1st and 2nd 

 columns of the above table a curve is drawn, representing the 

 variations of temperature of the calorimeter. It is composed 

 of three nearly straight parts (the regular course of which 

 serves as a proof that the readings are free from mistakes) ; 

 the inclination of the first and third branches enables us to 

 determine the influence of external heating; or cooling on the 

 temperature of the calorimeter. We find easily in the present 

 example : — 



