walter bothe (2 Ergebnisse)

1. Auflage. 8°, illustrierte Originalbroschur ( Paperback) 12 S. + 14 schwarz-weiße Bildtafeln leicht bestaubt, leicht lichtrandig, leicht angerändert, sonst gutes Exemplar.

231 x 160 mm. 8vo. pp. 204-212. Entire volume: iv, 416 pp. 6 figs., 2 tables. Navy blue cloth, gilt-stamped. Ex library Carnegie Institution of Washington Mount Wilson Observatory with call number gilt stamped on spine and library blind-stamp on front free end paper. Clean copy. FINE. RARE. FIRST EDITION. This is the first paper in the Zeitschrift fur physik in which Geiger and Bothe published the results of their collaboration which began in November 1913 at the Physikalisch-Technische Reichsanstalt in Berlin. In 1908 Geiger and Rutherford investigated the charge and nature of the ( particle. They devised an electrical technique in order to count the individual ( particles and compare results with those obtained by Erich Regener, who used the scintillation technique. Their ionization chamber was a cylinder at low pressure with a thin wire stretched coaxially. The wall of the cylinder had an entrance window at one end and was at high negative potential to the wire. An ( particle entering parallel to the wire generated a secondary avalanche, multiplying the primary ionization effect a thousandfold. The resulting voltage step on the central wire was measured by a sensitive electrometer. In October 1912, Geiger went to Berlin and continued experiments on the counting of ( particles. Varying the form and dimensions of the central electrode, he found an arrangement which came to be known as the Spitzenzahler or "point counter," since "the whole working of the apparatus depends on the point of the needle." The great advantage of this device was that in addition to ( particles, it could for the first time, count ( particles as well as other types of radiation. Geiger became the editor of the Zeitschrift fur physik beginning in 1936. DSB, V, pp. 330-333.