Meteorological observations kept on board the ship Earl of Hardwicke, by Alexander Henning. Daily observations on the steamship Earl of Hardwicke, at sea, commencing on 25 January 1839, and presumably on the return leg of its voyage, from Calcutta [Kolkata], India, to Portsmouth, England. Columns give information on: day and date of observations; latitude and longitude [pp.4-5 the entry for 12 February notes 'Cape of Good Hope']; barometer and sympiesometer readings at 9.30am, noon, 3.00pm, 4.30pm and 10.30pm; with air and sea temperature readings at 8.00am and general remarks on weather, including wind. Headed [p.1]: 'Meteorological obsns. made at sea on board the Earl of Hardwicke HBMS by Captn. Henning. Communicated from Captn. H. to the Phys. & Met. Comm. RS. by Sir J. Herschel'. Signed [p.11] by Alexander Henning. 25 January 1839-17 April 1839