Daniell, John F.

John F. (1790-1845), an English scientist. Born in London. Professor of chemistry in King's College, London, 1831. Daniell invented the first form of electric battery by which a steady current could be obtained for a considerable length of time. The Daniell cell consists of a copper plate immersed in a solution of copper sulphate in an outer glass jar, and a zinc plate immersed in sulphuric acid in an inner porous cup. The gravity cell used in telegraph stations is a modification of Daniell's, which dispenses with the porous cup. Daniell's Meteorological Essays was the first attempt made to account for all the then known phenomena of the atmosphere. He also published an essay on Artificial Climate. The Royal Society conferred upon him all of the medals, viz., three, which they had at their disposal.