Unpublished drawing, electrical increaser by Henry Upington Drawing of the design and construction of Upington's apparatus called an 'electrical increaser'. 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. [1817]