38 



MAGNETICAL OBSERVATIONS. 



OBSERVATIONS AT RANCHO TLAMACAS. 



Description of Station No. VIII.' — The magnetic station was established at the 



sulphur foundry, called llancho Tlamacas, on a small 

 depression of the ground between the foundry ovens 

 (to the north) and three Indian huts (to the south 

 and southwest.) 



The height of the station above the level of the 

 Mexican Gulf is 12,750 English feet. 



A pointed rock on the northeast side of the volcanic 

 cone, a little below the limit of perpetual snow, Avas 

 used for a mark (A) in the determinatioji of absolute declination. 



Station No. VIII. Rancho Tlamacas. 

 Latitude 19° 3'. Longitude 98° W. of Greenwich. 



' There has also been made a complete set of magnetioal observations at the town of Chalev, in the 

 valley of Mexico (latitude 19° 18', longitude 98° 51' west of Greenwich), and this station is called No. 

 VII. The results of these observations only will be given in the following pages, as the record of them 

 was lost. 



