The story
Named after physicists Albert Einstein and Wander Johannes de Haas, who jointly published the first observation of the effect in 1915. It had been predicted by Owen Willans Richardson in 1908.
Etymology from Wiktionary, CC BY-SA 4.0.
Einstein–de Haas effect
Today it means: A physical phenomenon in which a change in the magnetic moment of a free body causes the body to rotate, as a consequence of the conservation of angular momentum. Full definition →