Uber eine neue Art sehr schneller B-Strahlen.

Julius Springer, 1929. 231 x 155 mm. 8vo. 686-702 pp. [Entire volume: viii, 885 pp.] 9 figs., 2 tables. Navy cloth, gilt spine. Blind-stamp of the Carnegie Institution of Washington, Mount Wilson Observatory. Fine. FIRST EDITION. In February of 1929 "Skobeltzyn notices that cosmic ray particles frequently occur in groups - first indication of showers." Pais. "After my first casual observation on the appearance of cosmic-ray tracks in a Wilson chamber [the term cosmic ray (which had not yet been adopted) was not mentioned by me on that occasion, nor even Hohenstrahlung], a full report on the corresponding results of my work was published in 1929." Skobeltzyn. "Meanwhile, in Leningrad, Skobeltzyn, who had been studying radioactive y radiation, began using the Wilson cloud chamber to observe the trajectories of cosmic-ray particles in a magnetic field, where a charged particle's track is curved, with a radius of curvature directly proportional to the particle momentum and inversely proportional to the magnetic field. He also noted that tracks appeared to be associated with each other, to a degree difficult to account for by the scattering processes known at that time. SKOBELTZYN'S WORK WAS THE FIRST VISUAL METHOD FOR OBSERVING PROCESSES OF PARTICLES WITH ENERGIES HIGHER THAN THOSE AVAILABLE FROM RADIOACTIVE SOURCES." Brown, & Hoddeson, "Birth of elementary particle physics: 1930-1950," in Brown & Hoddeson, The birth of particle physics, pp. 8-9. Pais, Inward bound, p. 404; Skobeltzyn, "The early stage of cosmic-ray particle research," in Brown & Hoddeson, The birth of particle physics, pp. 112-113. First Edition.

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