. Annual report of the Board of Regents of the Smithsonian Institution . position by rotation of the Nicol, indicating thatlight from the edges of these lines is circularly polarized in opposite displacements of the widened lines appeai*ed to be precisely similar incharacter to those detected by Zeeman in his first observations of radiation ina magnetic field. A series of photographs, made with the Nicol set at various angles, soonshowed the two positions giving the maximum effect. At these positions theweaker components of the strongest doublets are not always completely cutoff
. Annual report of the Board of Regents of the Smithsonian Institution . position by rotation of the Nicol, indicating thatlight from the edges of these lines is circularly polarized in opposite displacements of the widened lines appeai*ed to be precisely similar incharacter to those detected by Zeeman in his first observations of radiation ina magnetic field. A series of photographs, made with the Nicol set at various angles, soonshowed the two positions giving the maximum effect. At these positions theweaker components of the strongest doublets are not always completely cutoff, but their intensities are greatly reduced. Sometimes hardly a trace ofthe Weaker component remains, as may be seen in the case of the vanadiumdoublet at \ (pi. 4). In this plate No. 5 shows the doublet in theordinary spot spectrum, photographed without the rhomb and Nicol. No. 4, ^A study of the elliptical polarization of these mirrors has been made byDoctor St. John. Astrophysical Journal, Vol. XXVI, p. 299, 1907, Smithsonian Report, 1908.—Abbot. Plate Smithsonian Report, 1 908.—Abbot. Plate 5.
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