Letter, correcting tidal observations from John Hansfield to John Augustus Lloyd Letter from Hansfield to Lloyd regarding a correction to tidal observations previously sent from Hansfield to Lloyd. Relates to Lloyd's paper titled 'An account of operations carried on for ascertaining the difference of level between the River Thames at London Bridge and the sea; and also for determining the height above the level of the sea, &c. of intermediate points passed over between Sheerness and London Bridge'. Subject: Hydrography This letter was not published in Philosophical Transactions. Written by Hansfield at Penryn [Cornwall] and addressed to Lloyd at 33 [Eliops?] Terrace, New Road, London. 17 December 1830