38 



MAGNETICAL OBSERVATIONS. 



Foundry Ovciu 



OBSERVATIONS AT RANCIIO TLAMACAS. 



Description of Station No. VIII. 1 The magnetic station was established at the 



sulphur foundry, called Ilancho 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, was 

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



STATION No. VIII. RANCIIO TLAMACAS. 

 Latitude 19 3 . Longitude 98 W. of Greenwich. 



1 There has also been made a complete set of magnctical 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. 



