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Astronomy - Feilitzsch, Ottokar Fabian Karl von. Optical Investigations Prompted by the Total Solar Eclipse of July 28, 1851. With 3 colored lithographic plates. Greifswald, Koch, 1852. 2 leaves, 63 pp. 21.5 x 13.5 cm. Contemporary half-cloth binding with title on spine. First edition. - Plate 2 features 3 mounted, fold-out illustrations of spectral lines. - Feilitzsch (1817–1885) examines physical and optical phenomena observed during the total solar eclipse of July 28, 1851. In doing so, Feilitzsch analyzes the influence of light sources, diffraction, interference, and the Earth’s atmosphere on the visibility of colors (such as shades of red and yellow versus blue and violet) in the umbra. - Good copy.
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