M A G X E T I C A L 15 S E R V A T I N S. 



OBSERVATIONS AT THE CITY OF MEXICO. 



Description of Station No. VI. The instruments were mounted on the arched 

 roof of the church in the Convent San Angustin. This is the same place where 

 BARON VON HUMBOLDT made his observations about fifty-seven years ago. The roof 

 is entirely of bricks, and there is no iron within fifty feet of the station, farther 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 AUOUSTIN. 

 Latitude 19 20 . Longitude 99 5 W. of Greenwich. 



