6 REPORTON 



Point Macoripe Light-house is N. 75 38' E. The position occupied by the 



instruments is in 



Lat. 3 43' 59" 8. 



Long. 2 h 34 m 6 9 W.' 



The latitude was deduced from my own observations, and the longitude was 

 taken from the list of geographical positions given in Raper's Navigation. 



PERNAMBUCO, Brazil. The ship was not swung in this port because there was 

 not room to do it in the position where she took her coal, and as she only remained 

 in the harbor twenty-four hours, there was not time to take up another position in 

 order to swing. 



The magnetic and astronomical observations on shore were made on the white 

 sand beach, at a spot from which the true bearing of the salient angle of the 

 southeast bastion of Fort Brum is N. 15 46' W., and its distance four hundred 

 and thirty feet. 



Assuming the position of the light-house, near to Fort Picao, to be lat. 8 3' 42" 

 S., long. 2 h 19 m 26 8 .8 W., as it is given in the English Admiralty List of Lights, 

 edition of 1866, then, according to the English Admiralty Chart, the position 

 occupied by the instruments is in 



Lat. 8 3' 37" S. 

 Long. 2 h 19 m 28 9 .2 W. 



BAHIA, Brazil. The ship was swung in this harbor, on December 30th, 1865, 

 in the usual manner. Her position at the time was lat. 12 59' S., long. 38 31' W. 

 Joint XII on the after turret was 0.6 of an inch to starboard. 



The magnetic and astronomical observations of December 27th were made at a 

 spot, one hundred and fifty feet from the water's edge, situated in a cocoanut grove 

 on the beach about half-way between Monserat Point and Fort Victoria. The soil 

 is a coarse white sand. It was not possible to get any bearings which would define 

 the exact position, but the above directions are sufficient to enable any one to find 

 the place very nearly. 



Assuming the position of Fort St. Antonio Light to be lat. 13 0' 55" S., long. 

 2 h 34 m 6'.9 W., then, according to the English Admiralty Chart, the position occu- 

 pied by the instruments is in 



Lat. 12 56' 55" S. 

 Long. 2 h 34 m 0'.5 W. 



Rio JANEIRO, Brazil The ship was swung in this harbor, on January 10th, 1866, 

 in the usual manner; but, owing to a strong wind which was blowing at the time, it 

 was not possible to get her through more than seventeen points. Her position was 

 lat. 22 54' S., long. 43 9' W. Joint XII on the after turret was 0.8 of an inch 

 to port. 



During the whole week we were at Rio there was not one clear day. Conse- 

 quently it was extremely difficult to make astronomical observations, and it was 

 only by patiently watching for the sun and seizing the opportunities when it was 



