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(SCIENTISTS.) BOHR, NIELS. The Penetration of Atomic Particles through Matter. Signed and Inscribed, "Professor H[elmut L.] Bradt / with kind regards," on the title-page at upper edge. 144 pages, 8vo, printed wrappers, "H.L. Bradt / 1949" penciled in Bradt's hand at upper right of front cover, scattered minor soiling and wear; extreme end of signature runs off right edge, notes and underlining in Bradt's hand scattered throughout in pencil. first edition. Copenhagen, 1948; inscription: Np, circa 1949
with--seven pages of notes written by Bradt including equations and diagrams analyzing and criticizing Bohr's work, laid in. Helmut L. Bradt (1917-1950) was a visiting professor of physics at the University of Rochester who, with Morton F. Kaplan, recorded photographic evidence of a new atomic particle: the neutral meson. His father, Gustav Bradt, was a friend of Albert Einstein.
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