MAGNETIC OBSERVATIONS. 



21 



Ex. ther. 76 

 Refraction = 130". 2 

 Parallax = + 8.0 



At. ther. 79 Bar. 30.02 inches. 



Sun's declination 20 26' 55". 2 

 Latitude 34 53 39 



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 



45 C 



5 

 4 



i 



3 

 4 



32' 3 - 



3 m 5 s - 2 

 10 51.4 



13 56.6 



29.6 



27.0 



55-8 



56 22.8 



2 

 II 



44 



Double Altitudes of the Sun for Time, observed on Rat Island, harbor of Monte Video, Uruguay, 



Index correction. 



Ex. ther. 74 

 Refraction = 62". 7 

 Parallax = -f 6.5 



January z^th, 1866. 



23 



20 



At. ther. Bar. 



Sun's declination 19" 6' 33".8 

 Latitude 34 53 18 



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 Sandy Point, in the Straits of Magellan, 



February ith, 1866. 



IO 



Index correction. 



Ex. ther. 52 

 Refraction = 56". 9 

 Parallax = + 6. i 



Correction = + 16' 5s".o 



At. ther. 70 Bar. 30.04 inches. 



Sun's declination 15 14' is"- 6 

 Latitude 53 I0 20 



Mean of observed double altitudes 

 Local apparent time . 

 Equation of time 



9 5 



~h ! 



10" 



O" 



2 B .2 



25-5 



