APPENDIX. 3S3 



Santos (the Arsenal). — By twelve chronometers this place is 

 3° ir 31" west of Rio de Janeiro, or 4G° 16' 33" 



St. Catherine (Flag Staff of S*''.Cruz D'Anhatomirim) is, by- 

 fifteen chronometrical results, 5° 24' 38" to the west of Rio de 

 Janeiro, or 48° 29' 41" 



Port Sta. Elena (the spot marked " Observatory" on the plan). — 

 Eleven chronometers made it 10° 23' 4G" west of the Island of 

 Gorriti, or 65° 17' 25" 



Cape Virgins (extremity of the cliff). — By ten chronometers is 

 13" 24' 8" to the west of Gorriti, or 68° 17' 46" west of Green- 

 wich ; but by comparing ft with Port Famine, from which ten chro- 

 nometers make it 2° 36' 0" to the eastward, the result is 68° 18' 01"; 

 the mean of the two determinations makes it 68° 17' 53" 



Port Gallant (Wigwam Point). — By twenty-one chronometers 

 is 1° 2' 55" west of Port Famine, or 71° 56' 57" 



Harbour of Mercy (Observation Islet) at the western end of the 

 Strait of Magalhaens is 3° 40' 55" west of Port Famine, or 

 74° 34' 56" west of Greenwich. By the survey, however, it is 

 laid down in 74° 35' 31" 



During the voyage various astronomical observations were made 

 for the longitude, the summary of which is as follows : 



Period. 



Place, 



Between 

 the 



a 



and 



No. of Series. 



Longitude 



by 

 Observation. 



Longitude 

 Chronometer. 



On each 



side. 



In all. 



Sept, 1826 

 Oct. 1828 

 Nov. 1829 

 Jan. 1830 



Rio de Janeiro 



Gorriti* 



Chiloe 



Valparaiso. . . . 





 © 

 © 

 © 



8 



9 



8 



16 



16 

 18 

 16 

 32 



/ // 

 43 8 18 



54 53 40 



73 48 42 



71 35 10 



o / // 

 43 5 3 



54 53 38 



73 50 25 



71 34 12 



* The longitude of Gorriti by Captain Stokes's luttars was 54° 57' W ; 

 that of Monte Video (Rat Island) 56° 14'; of Port Famine old observa- 

 tory (at the west side of the bay) 70° 57'; and of Villegagnon Island, at 

 Rio de Janeiro, 43° 9' W. (each to the nearest minute only). 



Captain Stokes M'as an excellent observer, and used one of Troughton's 

 best repeating reflecting circles. His lunar observations, which were 



very 



