636 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



sufficiently accurate for any purpose for which such graphs could reason- 

 ably be used.* 



Type A. The Brnyton Cycle. The final temperature curves for this 

 type are represented in Figure 3, and their general shape shows at once 



50 



100 



150 



300 



400 



450 500 



Q m BTU 



200 250 



FlGCRE 3. 



Tij]->e A. Final temperature. Sliowing, for Brayton cycles (adiabatic compres- 

 sion), the temperature of the gas after its expansion. 



the advantage of a high compression ratio. It should be noticed that 

 any final temperature not lower than the initial temperature is possible, 

 it being only necessary to choose a sufficiently small value for Q. That 



* In the numerical work, the following constants (mostly from Peabody) were 



used: 



Cp=: 0.2375 B.T. U., 



K = 1.405, 



g = 32.17 feet per second, 



J =778. 

 The standard value for the temperature parameter was taken as 

 ta - 80° F. or T^ ~ 541° F. Abs. 



The unit of mass used was one pound (gravitational). The resulting Te is in 

 Fahrenheit degrees absolute, but the results have always been expressed on the 

 ordinary scale. Fis in feet per second, and W in foot pounds. 



