Sir James Alfred Ewing KCB (27 March 1855 - 7 January 1935) was a Scottish physicist and engineer, best known for his work on the magnetic properties of metals and, in particular, for his discovery of, and coinage of the word, hysteresis.

(Note: According to the book Sir Alfred Ewing: A Pioneer in Physics and Engineering (1946) by Professor Bates, the discovery of magnetic hysteresis probably occurred before Ewing. However, Ewing re-discovered it, studied it in detail and coined the word hysteresis. Please see reference below.)

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