VOLCANO POPOCATEPETL AND ITS VICINITY. 



OBSERVATIONS OP HORIZONTAL ANGLES. 



Plain ON THE IxTACciHUATL, February 4 IS^i? _V,.fnr= „i*-. ^ i • , . 

 , ) ^'-"ruary t, lao/.— j^itel s altitude and azimuth instrument. 



75 



Station A. 



Object. 



Station B. 



Circle readings. 



IxtaccihuatI, 

 Highest peak. 



IxtaccihuatI, 

 South peak. 



Popocatepetl, 

 West peak. 



49° 22' 60' 

 50 

 75 

 60 



49 23 10 







15 



10 



113 12 40 



25 



30 



5 



113 12 40 

 30 

 40 

 10 



130 37 50 

 50 

 45 

 45 



197 55 20 



25 



5 



10 



197 55 40 

 35 

 15 

 30 



23' 35" 

 30 

 40 

 40 



22 45 

 30 

 55 

 35 



12 45 

 40 

 45 

 20 



12 35 

 25 

 35 

 10 



37 50 

 40 

 70 

 45 



20 



20 







10 



55 50 

 40 

 30 

 35 



55 



23' 30" 

 20 

 40 

 30 



22 50 

 40 

 65 

 60 



12 45 

 50 

 70 

 30 



12 20 

 10 

 25 



11 50 



37 60 

 60 

 65 

 40 



55 55 

 50 

 30 

 40 



55 60 

 55 

 40 

 55 



23' 10" 

 5 

 25 



25 



23 30 

 45 

 45 

 40 



12 35 

 30 

 05 

 25 



11 70 

 50 

 60 

 50 



37 70 

 60 

 75 

 50 



55 70 

 60 

 40 

 60 



55 50 

 40 

 25 

 35 



Station B. 



Object. 



Station A. 



Popocatepetl, 

 West peak. 



Circle readings. 



91° 14' 10" 

 5 

 20 

 5 



91 14 20 



5 



20 



5 



3 10 







20 



15 



60 



14' 20" 

 15 

 30 

 20 



14 20 

 10 

 25 

 10 



3 5 







15 



5 



14' 5" 

 20 

 30 

 15 



13 50 

 50 

 60 

 40 



3 35 

 35 

 50 

 40 



13' 60" 

 50 

 70 

 60 



13 50 

 40 

 45 

 50 



3 

 10 

 30 

 10 



Means. 



49° 23' 1".2 



23 36.2 

 23 30.0 

 23 16.2 



49 23 8.8 



22 41.2 



22 53.8 



23 40.0 



113 



113 



12 25.0 

 12 37.5 

 12 48.8 

 12 38.8 



12 30.0 

 12 26.2 

 12 11.2 

 57.5 



49° 23' 13".4 



11 



130 



197 



197 



37 47.5 



37 51.2 



37 56.2 



38 3.8 



113 12 26.8 



130 37 54.7 



197 65 36.0 



Means. 



91° 14' O".: 



00 2 52.2 



