The volume contains logs of the daily proceedings of H.M.S. 'Sulphur' and H.M.S. 'Harrier' kept by F.G. Simpkinson, travelling mainly along the western coast of South America. There are different types of entry for whether the ship was sailing or was docked. The former give the wind direction and record remarks for a.m. and p.m. on the weather, the tasks Simpkinson was employed on, and the arrival and departure of other vessels. The latter give additional information, including course, distance, latitude and longitude, bearings and distance, and speed. Each log is preceded by a title page. The volume contains the following logs: The log of H.M.S. 'Sulphur' (Captain Frederick William Beechey), 25 January 1836 - 30 June 1836, recording this route: at sea (at the Equator), St Catherine's, Valparaiso. The log of H.M.S. 'Sulphur' (Acting Commander Henry Kellett), 1 July 1836 - 12 February 1837, recording this route: Valparaiso, Callao, River Guayaquil, Puna, Port St Elena, Pelado Island, Solango, Monte Christi, Charapoto, Cojimies, Cape St Francisco, Atacames, River Esmeraldas, San Pedro, Point Mangles, Tumaco, Gorgona, Taboga Bay. The log of H.M.S. 'Sulphur' (Commander Edward Belcher), 13 February 1837 - 16 June 1838, recording this route: Panama, Magnetic Island, Realeja Harbour, Libertad, San Blas, Honolulu Harbour, Port Etches (at Prince William Sound), Sitka Harbour, San Francisco, San Blas, Acapulco Harbour, Realejo Harbour, Catalina Bay, Realejo Harbour, Callao Bay. The log of H.M.S. 'Harrier' (Commander William Henry Hallowell Carew), 17 June 1838 - 16 September 1838, recording this route: Callao Bay, Pisco Bay, Callao Bay, Arica Bay, Islay Bay, Valparaiso Bay, Callao Bay.