Table 127. 14^ 



DETERMINATION OF HEIGHTS BY THE BAROMETER. 



Formula of Babinet : Z ^ C 



B„-B 



Bo+ B 



C (in feet) = 52494 i -f- -5Jt — ** English measures. 

 L goo J 



C (in meters) =: 16000 I i -\- ^ ^ " ~'~ — ; metric measures. 

 1- 1000 J 



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



Bf), B := 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 of C. 



Values only approximate. Not good for great altitudes. A more rcci rate formula with 

 corresponding tables may be found in Smithsonian Meteorological Tables. 



Smithsonian Tables. 



