(Paris, Gauthier-Villars), 1897. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 124, No 9. Pp. (429-) 480. (Entire issue offered). Becquerel's paper: pp. 438-444. A small tear to inner lower margin. Disbound.
Reference : 49452
First printing. In 1896 Becquerel made his landmark discovery of radioactivity and in this follow-up paper he further established some of the properties of the radiation so that it could be identified unambiguously.
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