TABLE 157. 



169 



DETERMINATION OF HEIGHTS BY THE BAROMETER, 



Formula of Babinet: Z C ^ B . 

 B + B 



C (in feet) = 52494 [i + /0 + *~ 

 C (in meters) = 16000 [i + il^J 



I English measures. 



metric measures. 



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

 B Q , 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. 



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

 corresponding tables may be found in Smithsonian Meteorological Tables, 3 revised ed. 1906- 



SMITHSONIAN TABLES. 



