Fifth Letter on Voltaic Combinations, with some Account of the Effects of a large Constant Battery. Addressed to Michael Faraday. Received April 11, Read May 30, 1839.

(London, Richard and John E. Taylor, 1839). 4to. No wrappers as extracted from "Philosophical Transactions" 1839 - Part I. Pp. 89-95. Clean and fine. First printing of an importent paper in which Daniell further records his experiments with his invention the "Daniell Cell" from 1836. "The use of such cells, often coupled together in long chains to give a large electromotive force, gave great impetus to research in all branches of current electricity and also lead to commercial applications in gilding, electroplating, and glyphography."(DSB III, p. 557)In 1831 Daniell was appointed proffesor of Chemistry at King's College London. He invented several scientific instruments, including a hygrometer for measuring humidity he is best known for his work in electrochemistry, his interests having been aroused by the work of his good friend faraday. Volta's battery had the defect of rapid diminution in current. What was needed, however, was a battery yielding a constant current over a considerable lenght of time. In 1836 Daniell succeeded, producing the Daniell cell, of copper and zinc. his was the first reliable source of electric current.…