613 



TABLE 648.— DETERMINATION OF HEIGHTS BY THE BAROMETER 



Bo— B 



Formula of Babinet : Z = C 



Bo + B 



C (in feet) = 52494 1 + " "*~ English measures. 



C (in meters) = 16000 [l + ^j^ ] 



metric measures. 



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



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



sources of instrumental error. 



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

 VALUES OF C 



SMITHSONIAN PHYSICAL TABLES 



