FOR HIGH LEVELS IN THE EARTH's ATMOSPHERE. 49 



From equation (23) are obtained the following : 



E^:^ = 12.966(/^ + 459.4) E^j, = 14.920(<^ + 559.4) E|;2 = 17.535(<^ + 459.4) 



Elli = 13.186(<, + 459.4) E^ = 15.20G(<^ + 459.4) E't" = 17.929(<^ + 459.4) 



E^i = 13.410(<^ + 459.4) Et^ = 15.498(<^ + 459.4) E|:J = 18.;340(<^ + 459.4) 



E»:» = 13.640(<^ + 459.4) Eg;" = 15.801 (<^ + 459.4) E|i;» = 18.773(;^ + 459.4) 



El:^= 13.877(^^+459.4) E:i« = 16.11 G(<^ + 459.4) Ejl':S = 19.230(<^ + 459.4) 



Etl = 14.122(/^ + 459.4) E^i = 16.445(<^ + 459.4) E^H = 19.703(/^ + 459.4) 



E^i = 14.375(<^ + 459.4) E^^ = 16.788(^, + 459.4) E'^i = 20.204(<^ + 459.4) 



EP;» = 14.640(/^ + 459.4) Ei^? = 17.148(<^ + 459.4) E[l:l = 20.736(<^ + 459.4) 



From equation (24) there results 



Table 9 contains the values of EijJ^ . . . Ej^^ for each whole degree Fahrenheit of the 

 virtual temperature between the limits tr = 15° and t^ = 99°- 



Table 10 contains the values of n[-+^'""* as a function of py and tr for every tenth 

 of an inch of barometric pressure between the limits jj,- — 19.0 inches and 2iv = 30.9 

 inches and for every ten degrees of the Fahrenheit scale. 



In calculating the value of p^ those level surfaces of gravity that lie beneath the 

 surface of the earth are of course to be excluded. We compute first the pressure for 

 the first level surface above the ground that is a whole multiple of 10 000. For ex- 

 ample, in Omaha this would be F= 20 000 since the station-barometer there is in 

 the level surface 18 550. If we substitute Fq = 18 550 and F = 20 000 in (24) we 

 obtain the difference in pressure between the level surface of gravity F = 20 000 and 

 the station-barometer at Omaha, viz. : 



TT20 000 _ ) _ 



'■'^18650 — ri8650 /"ZO OOOJ 



Table 11 contains these values of nj^^oo expressed as a function of the pressure 2hf.55o 

 recorded by the station-barometer at Omaha, and the mean virtual temperature, t, 

 between F = 18 550 and F= 20 000. 



