One of France's oldest science museums, the Ampère Museum, has just revealed a treasure hidden in its reserves: the only complete and authentic version of the Einstein-de Haas experiment, a rare ...

LONDON. Physical Society, April 26.—Mr. Walter Baily, Vice-President, in the chair.—Prof. S. P. Thompson read a note on a neglected experiment of Ampère. Ampère, in 1822, made an experiment ...