MAGNETIC OBSERVATIONS. 



29 



Observations of the Sun, made Novcm. er 28tA, 1865, to determine the true bearing of the object used 

 as an azimuth mark in swinging the ship at Isle Royal, Salute Islands. 



Observations of the Sun, made December zq/A, 1865, to determine the true bearing of the object used 

 as an azimuth mark in swinging the ship at Bahia, Brazil. 



When the sun's true zenith distance was about 90, the angle between its nearest limb and a con- 

 spicuous tree was measured and found to be 31 38', the tree being to the right of the sun. 

 $,= 12 59' 5 = 23 12' 



True bearing of sun S. 66 9' W. 



L Sun to tree 3 1 3 s 



Sun's semi-diameter . . . . . 



True bearing of tree 



o 16 



. N. 81 57 



