LSE4096030 Andre Marie Ampere sought to understand when Francois Arago drew two keys from his pocket - in 'Physique populaire' by Emile Desbeaux, 1891 by Unknown Artist, (19th century); Private Collection; (add.info.: Andr?? Marie Amp??re sought to understand when Fran??ois Arago drew two keys from his pocket - in ??s??? Physique populaire??? by Emile Desbeaux, 1891); Photo ?? Leonard de Selva.