30 



REPORT ON 



Observations of the Sun, made January 7 th, 1866, to determine the true bearing of the object used as 

 an azimuth mark in swinging the ship at Rio Janeiro, Brazil. 





5 h 5i m 3o s 

 53 45 



55 ° 



a 



ta 

 S 



c 



t. 



r 



a 

 b 

 C 



112° 2 



7 

 12 



T 



Chronometer slow 

 1 



5 53 2 5 



2 3 3 2 



— 6 36 



112 15 

 + i7 



Apparent time 



7 5° 2i 



112 32 



t 

 8 



M 

 $ — M 



62° 25' 



— 22 22 



— 22 54 



— 4i 38 

 18 44 



57 9 



57 8 



85 16 



120 45 



True bearing of sun 

 Z Sun to Corcovado . 

 Z Corcovado to building . 



True bearing of building 



S. 77° 21' E. 



120 45 



83 8 



N. 53 28 W. 



Observations of the Sun, made January 23d, 1866, to determine the true bearing of the object used as 

 an azimuth mark in swinging the ship at Monte Video, Uruguay. 

 Near sunset, when the true zenith distance of the sun was about 90°, the angle between its nearest 

 limb and the Light-house on the Mount, on the west side of the harbor, was measured. The uncor- 

 rected reading of the sextant was 69° 40', and the sun was to the left of the Light-house. 

 ii 69° 

 + 

 s + 



40' 



17 

 16 



— 34" 



— 19 



c 70 13 



True bearing of sun ....... S. 66° 



Z Sun to Light-house ........ 70 



Z Hillock to Light-house . . . . . . . 34 



True bearing of hillock N. 77 



W. 



52 W. 



Observations of the Sun, made February gth, 1866, to determine the true bearing of the object used as 

 an azimuth mark in swinging the ship at Sandy Point, i?i the Straits of Magellan. 





9 h i3 m 57 s 



15 19 



16 40 



a 



.? 



C 

 I 



r 



a 

 b 

 C 



119° 15' 

 32 



42 



2 



Chronometer slow 



* 



9 15 19 

 12 48 



— 14 3° 



119 30 



+ i7 

 + 16 



Apparent time 



9 13 37 



120 3 



t 

 S 



9 



M 

 V — M 



— 4i° 36' 



— 14 37 



— 53 " 



— 19 M 

 33 57 



5° 32 



— 1 



5° 3i 



89 34 



13° 54 



True bearing of sun 

 Z Mount St. Felipe to sun . 



True bearing of Mount St. Felipe 



N. 56" 20' E. 



13° 54 

 ~s! 7 14 w. 



