MAGNETIC OBSERVATIONS. 



25 



Mean of observed double altitudes 

 Local apparent time . 

 Equation of time 

 Local mean time 

 Mean of chronometer times 

 Chronometer fast of local mean time 

 Longitude west .... 

 Chronometer slow of Greenwich mean time 



95 



r 5 



.0 



9 h 



10™ 



1 3 s - 5 





3 



53-i 



9 



6 



20.4 



9 



26 



37-3 



o 



20 



16.9 



5 



18 



1.8 



4 



57 



44-9 



Double Altitudes of the Sun for Time, observed at Acapulco, Mexico, May 30//*, 1866. 



Index correction. 



I0» 



25 m 



36 s 







89° 



0' 



0' 



) 





26 



5-5 









I. 1 ) 







pQ 





26 



3«-5 









3° 









27 



49-5 







89 











) 





28 



22 









IS 







\2Q 





28 



54 









3° 







) 





Ex. 



ther. 



89 











At. 



ther. 





Refraction 







54" 



5 









Parallax 





= + 



6. 



1 







359° 



11' 



10" 



o° 



!5' 



0" 













14 



40 







20 





!5 







359 



1 1 



10. 







14 



53-3 



Correction = -f 16' 5 8". 3 



;° Bar. 30.10 inches. 



Sun's declination + 21 ° 48' 7" 

 Latitude +16 50 3 



Mean of observed double altitudes 

 Local apparent time . 

 Equation of time 

 Local mean time 

 Mean of chronometer times 

 Chronometer fast of local mean time 

 Longitude west .... 

 Chronometer slow of Greenwich mean time 



l 9 u 



*5 



.0 



8 h 



4 8 m 



38"-4 





2 



46.4 



8 



45 



52.0 







27 



14.2 



1 



4i 



22.2 



6 



39 



29.4 



4 



58 



7.2 



Double Altitudes of the Sun for Time, observed in Magdalena Bay, Lower California, 



June Mi, 1866. 



Index correction. 



20 m 49 s 





ioo° 45' 



21 23 





3° 



21 56 





15 



23 8.5 





100 45 



23 41-5 





3° 



24 5 





15 



Ex. ther. 



69° 



Refraction 



= — 46". 4 



Parallax 





= + 5-4 



°") 



O ^2© 



2Q 



At. ther. 



359° 



10' 



5°" 



o° 



14' 



40' 







11 



20 





14 



50 







10 



3° 





!5 









359 



10 



53-3 







14 



5°- 







Correction = + 17' 8". 4 



70 Bar. 30.02 inches. 



Sun's declination + 22 53' 42" 

 Latitude + 24 38 



Mean of observed double altitudes 

 Local apparent time . 

 Equation of time 

 Local mean time 

 Mean of chronometer times 

 Chronometer fast of local mean time 

 Longitude west .... 

 Chronometer slow of Greenwich mean time 



o'" 



3° 



.0 



2 h 



53 m 



42 s -3 





1 



14-5 



2 



52 



27.8 



5 



22 



32.2 



2 



3° 



4.4 



7 



28 



24.0 



4 



58 



19.6 



February, 1872. 



