Table 18. 



REDUCTION OF THE BAROMETER TO SEA LEVEL. 



METRIC MEASURES. 

 Correction of 2000 m for Latitude: 2000 7n X 0.002662 cos 2 <h. 



For latitudes o° to 45^, the correction is to be subtracted. 

 For latitudes 45° to 90°, the correction is to be added. 



Smithsonian Tables. 



90 



