TABLE 147. 



DETERMINATION OF HEIGHTS BY THE BAROMETER, 



Formula of Babinet : Z = C B D ~ B . 

 + B 



t 



C (in feet) = 52494 |"i + /0 + * ~ 64 "| English measures. 

 l_ 900 J 



C (in metres) = 16000 |~i 4- 2 (*o + O"! metric measures. 



L 1000 J 



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

 2?o> B = barometric readings at the lower and upper stations respectively, corrected for all 



sources of instrumental error. 

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



Values of C. 



SMITHSONIAN TABLES. 



