32 



M A G N E T I C A L T. S E 11 V A T I N S. 



OBSERVATIOXS AT THE CITY OF MEXICO. 



Di'scrijitioii of Station No. VI. — The instruments were mounted on the arched 

 roof of the church in the Convent San Augustin. This is the same phxce where 

 Baron von Humboldt made his observations about fifty-seven years ago. Tlie roof 

 is entirely of bricks, and there is no iron witliin fifty feet of the station, forther off 

 are some iron railings, etc. 



The station is 75 feet above the ground, or 7,550 English feet above the level of 

 the sea. 



A church steeple, about fifteen miles west of the station, was used for a mark 

 (A) at the determination of absolute declination. 



Station No. VI. Mexico, Convent San Augustin. 

 Latitude 19° 26'. Longitude 99° 5' W. of Greenwich. 



