Table 66. 

 DETERMINATION OF HEIGHTS BY THE BAROMETER. 

 Formula of Babinet. 



Z ~ C B +B 



C (in feet) = 52494 1 -f -^ —English Measures. 



C (in metres) = 16000 1 4 — ^ ' — Metric Measures. 



v ' L 1000 J 



[n which Z = Difference of height of two stations in feet or metres. 



B a , 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. 



ENGLISH MEASURES. 



METRIC MEASURES. 



Imithsonian Tables. 



157 



