(Leipzig, Johann Ambrosius Barth, 1905). 8vo. No wrappers. Extracted from "Annalen der Physik" Vierte Folge. Bd. 18. Entire issue no. 15 offered. Pp. 991-1007. [Entire issue: Pp. 869-1084 + 6 folded plates.].
First appearance of Wien's paper on the energy of cathode rays in relation to the energy of the X-ray and secondary rays.
Order-nr.: 50546