. Carnegie Institution of Washington publication. On mixing CS2 with kerosene (about equal parts), types of fringes shownin figure 63, but with many more lines, were obtained. This is a combina-tion of both spindles and hyperbolae. Probably three layers of liquid arechiefly in question, viz, kerosene, kerosene + CS2, CS2, and the three stagesof form and the sinuous lines correspond to them. Fringes were sharp only ifviewed in front of the principal focal plane of the telescope. By submergingconvex or concave lenses, the hyperbolic parts or the spindles of the fringescould often be removed. Sim
. Carnegie Institution of Washington publication. On mixing CS2 with kerosene (about equal parts), types of fringes shownin figure 63, but with many more lines, were obtained. This is a combina-tion of both spindles and hyperbolae. Probably three layers of liquid arechiefly in question, viz, kerosene, kerosene + CS2, CS2, and the three stagesof form and the sinuous lines correspond to them. Fringes were sharp only ifviewed in front of the principal focal plane of the telescope. By submergingconvex or concave lenses, the hyperbolic parts or the spindles of the fringescould often be removed. Similar results were obtained with mixture of CSzand sweet oil, though this solution is more homogeneous. 50. Apparatus.—To obviate the tremor of apparatus which is inevitable inthe case of the long-distance interferometer, the parts were now screweddown at short distances in the cast-iron block B, figure 64. Here the rangesMH, HN of half-silvered plate H, and opaque mirrors M, N, did not exceed REVERSED AND NON-REVERSED SPECTRA. 97 14 cm., but t
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