Joule, James Prescott, a celebrated physicist, born at Salford; was a pupil of Dalton's, and devoted his time to physical and chemical research; made discoveries in connection with the production of heat by voltaic electricity, demonstrated the equivalence of heat and energy, and established on experimental grounds the doctrine of the conservation of energy (1818‒1889).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Jougs * Jourdan, Jean Baptiste, Comte von