8 REPORT ON 



bears N. 39° E., and is distant about one hundred feet. The light-house on the 

 Mount, on the west side of the harbor, bears N. 59° 0' W. The water's edge is 

 distant from the station about four hundred feet. The soil is a thin stratum of 

 very poor earth, covering a greenish-colored slaty rock, which crops out in many 

 places. Assuming the position of the light-house on the Mount to be lat. 34° 53' 15" 

 S., long. 3 h 44 m 59 3 .0 W., then, according to the English Admiralty Charts, the 

 position occupied by the instruments is in 



Lat. 34° 53' 39" S. 

 Long. 3 h 44 m 55 s .8 W. 



As a check, some magnetic observations were made, on January 19th, at a station 

 from which the true bearing of the light-house on the Mount is N. 89° 41' W., and 

 the true bearing of the light on the Cathedral is S. 17° 42' W. Assuming the 

 position of the light-house to be as stated above, and the light on the cathedral to 

 be in lat. 34° 54' 20" S., long. 3 h 44 m 50 a .O W., as given in the English Admiralty 

 List of Lights in South America, edition of 1865, the geographical position of this 

 station was 



Lat. 34° 53' 16" S. 



Long. 3 h 44 m 48 s . 3 W. 



It will be observed that the difference of longitude between the lights on the 

 Mount and on the cathedral, as deduced from the Admiralty List cited above, cannot 

 be made to agree with the positions given on the English Admiralty Chart. 



On January 24th some observations for time were made on Rat Island. Assum- 

 ing the position of the light-house on the Mount to be as stated above, then, accord- 

 ing to the English Admiralty Chart, the position of the station on Eat Island was 



Lat. 34° 53' 18" S. 

 Long. 3" 44'" 52\9 W. ' 



Sandy Point, Straits of Magellan. The ship was swung in this harbor, on 

 February 10th, 1866, in the usual manner. Her position at the time was lat. 53° 

 11' S., long. 70° 55' W. Joint XII on the after turret was 4.5 inches to port. 

 While we were lying here the ship was perfectly free to swing to the tide, but she 

 generally turned through an arc of only about ninety degrees, namely, from W.N. W. 

 to N.N.E. 



The observations on shore were made in the meadow, between the settlement 

 and the beach, at a spot from which the true bearing of the flagstaff was N. 47° 8' 

 W., and its distance about eight hundred feet. The soil is sandy, and there is no 

 rock anywhere near. The place was examined for local attraction by taking fore 

 and back sights with a compass, but nothing of the kind could be detected. 



Assuming the position of the flagstaff to be lat. 53° 10' 15" S., long. 4 h 43 m 36*. 

 W., as given on the English Admiralty Chart, edition of 1861, the position occupied 

 by the instruments is in 



Lat. 53° 10' 20" S. 

 Long. 4 h 43 m 35 s .3 W. 



