Introducing what came to be called the Hall effect:
Edwin Hall, On a New Action of the Magnet on Electric Currents, American Journal of Mathematics Vol. 2, No. 3 (Sep., 1879), pp. 287-292 (doi:10.2307/2369245)
Edwin H. Hall: On the “Rotational Coefficient” in Nickel and Cobalt, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science Series 5 Volume 12 Issue 74 (1881) [doi:10.1080/14786448108627086]