Unpublished manuscript, 'An account of an electrical increaser' from Henry Upington to George Pearson Upington's paper consists of a letter to Pearson and extracts of letters from Upington to Earl Stanhope [Charles Mahon], all written as a single piece of prose. Upington describes his invention of an 'electrical increaser' used to manifest weak amounts of elecric fluid so that they might affect an electrometer. Annotations appear throughout in graphite. Subject: Physics Written by Upington in Blair's Hill, Cork [Ireland]. Read to the Royal Society on 24 April 1817. Whilst the Royal Society declined to publish this letter, it was published in full in the Philosophical Magazine and Journal in 1818: Upington, Henry. 'Account of an electrical increaser for the unerring manifestation of small portions of the electric fluid'. The Philosophical Magazine and Journal, vol 52, no 248, December 1818, pp. 47-52. 24 February 1817