VILLARD, P. (PAUL ULRICH). - THE DISCOVERY OF GAMMA RAYS AND GAMMA RADIATION.

Sur la réflexion et la réfraction des rayons cathodiques et des rayons déviables du radium. (+) Sur le rayonnement du radium.

(Paris, Gauthier-Villars, 1900). 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 130, No 15 a. No 18. Pp. (962-) 1044 a. pp. (1145-) 1220. Entire issues offered. Villard's papers: pp. 1010-1012 a. 1178-1182, textillustrations. Clean and fine.

First apperance of Villard's two papers in which he announced and described the discovery of a new type of radiation more powerfull and penetrating than alpha-and beta rays. The new type of rays was named by Rutherford as gammarays.

Order-nr.: 51313