568 Mr. Lubbock on the Heat of Vapours 



The following example will serve to show in what manner the 

 table was calculated. 



Ex. — Calculation of the temperature and volume of steam for 

 the pressure of 180 lbs. per square inch. 



log 180 = 2-2552725 

 log 14-706= 1-1674946 



logp = 1-0877779 X -0134 = -01457622386 = log 1-03413 



1-17602 

 1-03413 



2-0651059 



log -14189 = 9-1519518 



2-9131541 = log 818-7 

 448-0 



Temp. Fahr. Air Therm. = 370-7 



4-8 



Temp. Fahr. Merc. Therm. = 375-5 



0-4109002 



logJL = 8-9122221 



^' 2-9131541 



2-2362764 - log 172 /^ - 172 



The following data are taken from M. de Pambour's work on 

 the Steam Engine, p. 238. 



I' = -25 1 V = 250 f = -5 (lb. per square inch) S = -14 



; _ I'o ft. a = 12-566 sq. ft. S= 927 cub. ft. 



2)" = 4 lbs. per square inch. c = -05 Z 



log t, = 2-3979400 log « = 2-3979400 



log a = 1-0991971 log a = 1-0991971 



log -30 = 9-4771213 log 1-05 = 0-0211893 



2-9742584 3-5183264 



lo- 5=9-9670797 log 5 = 9-9670797 



3 0071787 = log 1016-6 3-5512467 = log 3558-3 



/ = 1016-6 F = 3558-3 



