Joule, J.P. (1847). "On the Effects of Magnetism upon the Dimensions of Iron and Steel Bars". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 30, Third Series. Taylor & Francis: 76–87, 225–241. Retrieved 2009-07-19. Joule observed in this paper that he first reported the measurements in a "Conversazione" in Manchester, England, in (Sturgeon's) Annals of Electricity, Magnetism, and Chemistry 8, 219-224 (1842)