Narrative of the surveying voyages of his majesty's ships Adventure and Beagle (vol.2- Appendix): between the years 1826 and 1836 : describing their examination of the southern shores of South America, and the Beagles's circumnavigation of the globe

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