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. 349 Beagle's Chain of Meridian Distances and Resulting Longi- tudes in the Pacific Ocean, between Cape Horn and Otaheite. 1834—1835. Port Famine to San Carlos, Chiloe San Carlos to Valparaiso Valparaiso to Callao Callao to Chatham Island in the Galapagos Chatham Island to Charles Island Charles Island to Otaheite H. M. s. H. M. s. 11 53,5* 4 55 45,0 o8 59,2 4 46 45,8 22 09,0 5 08 54,8 49 32,8 5 58 27,6 o 03 39,5 6 02 07,1 3 56 12,3 9 58 19,4 Other Determinations. Beagle 1830 — Port Famine to Cape Horn, by true bearing of Sarmiento from Doris Peak Beagle 1829-30 — Cape Horn to San Carlos Beagle 1829 — Port Famine to San Carlos Beagle 1829 — San Carlos to Valparaiso Malaspina and Espinosa had an observatory at San Carlos, whose longitude they considered Their meridian distance t thence to Valparaiso was Malaspina'sand Espinosa's observations, calculated by Profes- sor Oltmanns, give for Valparaiso ... And for Callao Castle 14 46,5 26 39,9 11 54,0 09 00,2 4 55 47,5 o3 59,8 4 46 47,7 5 08 57.1 Repeated examination of the successive differences of longitude given in these pages, and the data on which they rest, leads me to think that the alterations spoken of by Captain King, in page 493 of Volume I., were unnecessary. By an unexceptionable true-bearing of Mount Sarmiento, from Doris Peak, I was enabled to connect the longitude of the outer coast with that of Port Famine in a most satisfactory manner. M. Lartigue, in the French frigate Clorinde (see Connaissance des Tems, for 1836), made the meridian distance between Callao and Valparaiso almost identical with that of Espinosa and Malaspina, as well as the above stated result of the Beagle's measurement. * oh. iim. 59,4s. -6,9s.=oh. 11m. 53,5s. t In Malaspina's expedition there were at least four chronometers, made by Arnold, besides others.