Meteorological observations kept on board the ship Earl of Hardwicke, by Alexander Henning. Daily observations on the steamship Earl of Hardwicke, departing from Spithead, England and sailing for Calcutta [Kolkata], India, with a return to England, sighting the Lizard on 6 May 1841 [p.21]. Columns give information on: day and date of observations; latitude and longitude; barometer and sympiesometer readings at 9.30am, noon, 3.00pm, and 10.30pm; with air and sea temperature readings at 8.00am and general remarks on weather, including wind. With a 'Register of the Barometer on Monday 22nd March 1841' [p.22]; and a barometer comparison between Captain Herring's instrument and that of the Royal Society, July 1841. Headed [p.1]: 'No. 273. Meteorological Register on board the Earl of Hardwicke during a Voyage from London to Calcutta & back to London kept by Captain Alex Henning'. Inscribed below: 'Communicated by Sir J. Herschel Recd' 2nd. Septr. 1841 S.H.C.' [Samuel Hunter Christie]. Inscribed above: Received July 30. 1841 from P.S. - J.F.W.H. communication for the R.Socy.' The paper is noted as having been read at the Royal Society on 18 November 1841: 'Meteorological register kept on board the Earl of Hardwicke, during a voyage from London to Calcutta and back to London', by Captain Alexander Henning, Abstracts of papers printed in the Philosophical Transactions of the Royal Society of London, v.4 (1843), p.329. 16 August 1840-6 May 1841