The Anomalous Dispersion of Cyanin, Volume 2, Issue 4

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University of Wisconsin, 1900 - Cyanin - 48 pages

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Page 250 - ... glass with a card pierced with a pin-hole. It was then seen that each prism (or oblique edge of crystal) produced two spectra oppositely polarised and widely separated. One of these spectra was normal ; there was nothing particular about it. The colours of the other were very anomalous, and, after many experiments, I came to the conclusion that they could only be explained by the supposition that the spectrum, after proceeding for a certain distance, stopped short and returned upon itself.
Page 291 - Versuch einer Theorie der (anomalen) Dispersion des Lichtes in einfach und doppelt brechenden Mitteln.
Page 288 - Louisville J. XIII., 304-312; Fort. d. Phys. XXIV., 264. 1868. E. MATHIEU, "Sur la dispersion de la lumiere." Ann. de Chim. (4), X., 128-136 ; Fort. d. Phys. XXIV., 274. 1869. CHALLIS, "Comparison of a theory of dispersion of light on the hypothesis of undulations with Ditscheiner's determinations of wave lengths and corresponding refracting indices.
Page 267 - X0 equals extinction index for wave length at perpendicular incidence. Where X,,, equals wave length in free ether of rays absorbed. Where D equals a constant depending, in the elestic theory, upon the refractive index of infinitely long waves, and, in the electro-magnetic theory, upon the dielectric constant of the medium. These equations are usually termed the Ketteler-Helmholtz dispersion formula, and were tested by Pfliiger3 as described in the first part of this paper.
Page 282 - This dark fringe is the only one in the whole system that can be identified. Substituting white light in front of slit, D, and having film No. I, on the path of the interferometer, a photograph was taken. The result is shown in a in figure 7 of plate 20. When looking at the fringes direct it was plain that the fringes marked on the photograph belonged together. Using film No. II, a pho* tograph seen in b, figure 7 (plate 20) was taken.
Page 274 - (b) Investigations in the Ultra Violet. — The' dispersion having been measured visually with the spectrometer as far into* the violet region as was possible, the photographic method employed by Pfliiger1 was, adopted to extend the work into the ultra violet. The...
Page 252 - FIG. 2. the diagonal band represents the final result after passing through both prisms. If now the dispersion of the second prism was irrational, as is the case with ordinary glass, the final result would be a curved band as is seen in the upper part of (b), Fig. 2. If the common glass prism is removed and a hollow prism filled with a cyanin solution, as used by Kundt...
Page 290 - Ueber den Zusammenhang zwischen Absorption und Brechung des Lichtes." Wiener Berichte (2), LXVIL, 4-7; Mondes, (2), XXX., 594-595; Chem. C. Bl. (1873), 161-162. 1874. E. KETTELER, "Das spezifische Gesetz der sogenannten anomalen Dispersion.
Page 281 - Ill, the photograph shown in figure 3 of the same plate was obtained. In these photographs it is to be noticed that beyond X= 345.6 no fringes appear. This is due to the absorption of shorter waves by the glass. Further, below X = 374.2, the intensity of the fringes in both halves of each exposure is practically the same, showing that the cyanin film in this part of the spectrum was perfectly transparent.
Page 282 - Ill in the interferometer. The strong absorption of this film made the resulting figure hard to distinguish so that even when the colors were seen directly, it was difficult to tell which was the central dark fringe in the part passing through the cyanin. Several observers, however, independently judged the pair marked in the figure to be correct. The index of refraction can be found by thg usual formula for thin films : — 1 j* W = 1+Ti (33).

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