Author:ELSTER, Johann Philipp Ludwig Julius (1854-1920) & F. K. Hans GEITEL (1855-1923)

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Versuche an Becquerelstrahlen. [with]: Weitere Versuche an Becquerelstrahlen.

By: ELSTER, Johann Philipp Ludwig Julius (1854-1920) & F. K. Hans GEITEL (1855-1923).

Price: $350.00

Publisher: In: Annalen der Physik und Chemie, Neue Folge, Band 66 + 69. Leipzig:, Johann Ambrosius Barth, 1898, 1899.: 1898

Seller ID: S3134


Two volumes. 222 x 153 mm. 8vo. Pages 735-740; 83-90. [Both volumes: viii,1208; viii, 876 pp.] Quarter brown cloth, marbled boards, gilt spines. Blind-stamps of the Carnegie Institution, Washington. Fine. FIRST EDITIONS. "Soon after the discovery (1896) of radioactivity Elster and Geitel began to study Becquerel rays, in order to determine the origin of the energy of these rays. [William] Crookes (1832-1919) had proposed the hypothesis that the air molecules with the greatest velocity stimulated the rays; energy was therefore extracted from the surrounding air. Elster and Geitel placed ur... View more info

Lichtelectrische Untersuchungen an polarisirtem Lichte.

By: ELSTER, Johann Philipp Ludwig Julius (1854-1920) & F. K. Hans GEITEL (1855-1923).

Price: $150.00

Publisher: In: Annalen der Physik und Chemie, Neue Folge, Band 55, No. 5, 1895. Leipzig:, Johann Ambrosius Barth, 1895.: 1895

Seller ID: S3133


222 x 154 mm. 8vo. Pages (684)-700. [Entire volume: viii, 224, xviii, (225)-744 pp.] 2 figs., 1 table. Quarter cloth, marbled boards, gilt spine. Blind stamp of the Carnegie Institution of Washington Solar Observatory. Fine. Elster and Geitel conducted a series of twenty investigations on the photoelectric effect beginning in 1889. "By use of a photocathode of a fluid, absolutely smooth potassium-sodium alloy, the dependence of the photoelectric current on the polarization of the light was discovered" by them. "The Elster-Geitel photocell was for decades the photometric instrument... View more info