Ueber ein Doppeltrogrefractometer und Untersuchungen mit demselben an Losungen von Bromcadmium, Zucker, Di- und Trichloressigsaure, sowie deren Kaliumsalzen.

In: Annalen der Physik und Chemie, Neue Folge, Band 68, No. 5, 1899. Leipzig:: Johann Ambrosius Barth, 1899., 1899. 222 x 151 mm. 8vo. Pages 1-45. [Entire volume: viii, 948 pp.] 3 figs., 16 tables. Quarter cloth, marbled boards, gilt spine. Blind stamp of the Carnegie Institution of Washington Solar Observatory. Fine. "Hallwachs was one of the pioneers of modern physics. . .. Hallwachs constructed electrical measuring devices and built, among other things, a quadrant electrometer and a double refractometer of high precision. At Leipzig in 1888 he investigated, (truncated) following the model of Heinrich Hertz's studies, photoelectric activity, establishing that through absorption of ultraviolet light, negatively charged metal plates discharge and uncharged metal plates become positively charged. This process, which is called the photoelectric effect or Hallwachs effect, forms the basis for the physics of the photoelectric cell and was theoretically interpreted in 1905 in Einstein's work on light quanta." DSB. References: DSB, VI, pp. 73-74; Pais, Subtle is the Lord, p. 380. (Inventory #: S3164)