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 15' o".o 



9 h io m i3". 5 



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 $oth, 1866. 



io h 25" 

 26 

 26 



27 

 28 

 28 



36' 



5-5 

 38-5 

 49-5 



22 



54 



89 



89 



Index correction. 



Ex. ther. 89 

 Refraction = 5 4". 5 

 Parallax = -f 6.0 



At. ther. 



Correction = + 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 



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



June %th, 1866. 



Index correction. 



S h 20- 49" 

 21 23 



21 56 



23 8-5 



23 41-5 



24 5 



100" 45 

 3 



100 45 

 3 

 15 



o 

 o 

 o 

 o 



o 



Correction = + 17' 8". 4 



Ex. ther. 69 

 Refraction = 46". 4 

 Parallax = + 5.4 



At. ther. 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 



. too" 30' o".o 



. 2" 53 m 42".3 



. i 14.5 



2 52 27.8 



5 22 32.2 



2 30 4.4 



7 28 24.0 



4 58 19.6 



February, 1873. 



