MAGNETIC OBSERVATIONS. 



19 



Mean of chronometer times 

 Chronometer slow of local mean time 

 Longitude west ...... 



Chronometer slow of Greenwich mean time 



3i" 

 36 

 l 9 

 56 



57-5 



34-8 



28.2 



3° 



Double Altitudes of the Sun for Time, observed at Bahia, Brazil, December 27 Hi, 1865. 



52 m IO 8 







98 30' 



52 31-5 







40 



52 54-5 







5° 



54 32 







98 30 



54 53-5 







40 



55 16.5 







5° 



Ex. ther. 



88 









Refraction 





= — 



45"-9 



Parallax 





= + 



5-7 



20 



u 



At. ther. 







Index 



correction. 







359° 



10' 



40" 

 5° 





o° 



16' 



10" 

 



359 



10 



45; O 









16 



5-o 



Correction =-(-16' 35". o 



Bar. 

 Sun's declination — 23° 19' 

 Latitude 



Mean of observed double altitudes 

 Local apparent time . 

 Equation of time 

 Local mean time 

 Mean of chronometer times 

 Chronometer slow of local mean time 

 Longitude west .... 

 Chronometer slow of Greenwich mean time 



Double Altitudes of the Sun for Time, observed at the Light-house in Fort St. Antonio, Bahia, Brazil, 



December 29th, 1865. 

 5°' o" I 



'3° 



19' 



33"- 8 





56 



55- 



98 



40' 



o".c 



9 h 



14° 



' 22 s .5 





1 



2 7-3 



9 



l 5 



49-8 



6 



53 



43-o 



2 



22 



6.8 



2 



34 



°-5 



4 



56 



7-3 



M" 



4b 8 . 5 



J 34 



15 



10 



I3S 



15 



3 1 





'5 



56 





16 



i9-5 





17 



i7-5 



J 34 



17 



44 



r 35 



18 



7 





18 



3*-5 





18 



54 





r 2 359° 10' 



5° 



Index correction. 



5°" I o° 16' 



50 



40 



2© 



3° 



359 10 46.7 o 16 6.7 



Correction =-(-16' 33". 3 



Ex. ther. 84 

 Refraction = — 22". 1 

 Parallax = + 3-3 



At. ther. 



Bar. 



Sun's declination 

 Latitude 



Mean of observed double altitudes 

 Local apparent time . 

 Equation of time 

 Local mean time 

 Mean of chronometer times 

 Chronometer slow of local mean time 

 Longitude west .... 

 Chronometer slow of Greenwich mean time 



23 

 13 



J 35 



[3 



3 1 ■ 



55- 



io h 36" 

 2 



10 38 

 & 16 

 2 22 

 2 34 

 4 5 6 



2 5-7 

 27.6 



53-3 



49-7 



3-6 



6.9 



10.5 



