THE THERMAL PROPERTIES OF STEAM 



^ F (T) are found. From the- curve through these points the con- 

 stants a, ft, and y are obtained. The equation for e, finally takes the 

 form 



Amn(n + l) p(i + 2opl), (C) 



and the constants are 





Metric 

 or - 0.320 

 ft - 0.0002268 

 7-7371 



Engli*h 

 0.320 

 O.OOOI26 



23583 



The constants a, m, and n are those of the characteristic equation. 



If in I .-I. CJ \.irious constant values of p are substituted, the result 

 is a family of c, -curves, ,-/(/). A comparison of this system of 

 <ycurves with t! ins estaNMn -<1 },\ Da 1 by Jakob t reveals 



certain essential dittm -net -. In Fig. 3 the curves for 2, 4, 6, and 8 kg. 



values of c, calculated from Eq. (C) agree fairly well with the experi- 

 nirntal values of Langen, Pier, and Holborn at high temperatures iooo- 

 2000 C. Jakob's values tend to run somewhat lower, and the Davis 

 system of values still lower. Hrnce it may be asserted that the system 

 derived from Eq. (C) (i) satisfies the Knoblauch and Mollier experi- 



Marks and Davis, Steam Tables and Diagrams, p. 97. 

 t Zeit. des Yeretn. deutach Ing., Vol. 66, pp. 1981-3. 1912. 



