Table 147. 



167 



DETERMINATION OF HEIGHTS BY THE BAROMETER. 



Formula of Babinet : Z : 



Bo-B 



Bo + B 

 C (in feet) =: 52494 [i + 4 + '' — 64 "j Engijsh measures. 



C (in metres) = 16000 i + ^ ^ " *" ' metric measures. 

 1- 1000 -I 



In which Z =: difference of height of two stations in feet or metres. 



Bo, B =3 barometric readings at the lower and upper stations respectively, corrected for all 



sources of instrumental error. 



^0, t = air temperatures at the lower and upper stations respectively. 



Values ol C. 



Smithsonian Tables. 



