Proceedings of the American Academy of Arts and Sciences. 

 Vol. XL. No. 19. — AriuL, 1905. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 

 HARVARD UNIVERSITY. 



^ PQ PLANE FOR THERMODYNAMIC CYCLIC 

 ANALYSIS. 



By Harvey N. Davis. 



With Thkee Charts akd Twenty-oxe Figures 



Investigations on Light and IIeat made or puBLisaED, wholly oa in pari, with Appbopbuiions 



FROM THE RUMFORD FoND. 



