Thermodynamic Cycles and Variable Specific Heat. 169 



as 



pressure. The various operations in the cycle are 

 follow : — 



1. Beginning at T the working fluid is compressed adia- 

 batically from volume v to volume v and temperature T . 



2. Heat is imparted to the working fluid at constant volume 

 from T to T l5 the pressure changing from p to p x . 



3. Heat is imparted to the working fluid at constant pres- 

 sure from T x to T 2 , the volume changing from v x to v 2 . 



4. Adiabatic expansion of the working fluid takes place 

 from T 2 to T 3 . 



5. Heat is rejected at constant volume from T 3 to T, the 

 pressure changing fromp 3 to^>. This brings the working 

 fluid back to its initial state. 



Fig. 1. 



Assuming now that 



K v = specific heat at constant volume = B + ST, 



where B and S are constants and T = absolute temperature, 

 and that 



K p = specific heat at constant pressure = A + ST, 



where A is a constant: 



Phil. Mag. S. 6. Vol. 34. No. 201. Sept. 1917. N 



