. Carnegie Institution of Washington publication. vely; that forthe given position of G and G only the rays a a issue coincidently at rays cd, cd issue at e\, ei, and, though brought to the identical focus REVERSED AND NON-REVERSED SPECTRA. 39 by the telescope, the distance e\e\ may be too large to admit of appreciableinterference. Hence the colored strip within which interferences occur willcomprise those wave-lengths which lie very near X, whereas the colors lyingnear X, etc., will be free from interference. If, however, the mirror M is displaced parallel to itself to M by the microm-e
. Carnegie Institution of Washington publication. vely; that forthe given position of G and G only the rays a a issue coincidently at rays cd, cd issue at e\, ei, and, though brought to the identical focus REVERSED AND NON-REVERSED SPECTRA. 39 by the telescope, the distance e\e\ may be too large to admit of appreciableinterference. Hence the colored strip within which interferences occur willcomprise those wave-lengths which lie very near X, whereas the colors lyingnear X, etc., will be free from interference. If, however, the mirror M is displaced parallel to itself to M by the microm-eter-screw, the rays cd and cd will now coincide at ei, whereas the raysfrom ab and ab will no longer issue coincidently and may not the interferences are transferred as a group from rays lying near X torays lying near X. It is obvious, therefore, that with the displacement of Mthe strip carrying interferences will shift through the spectrum and that anenormous play of the micrometer-slide at M will be available without the loss 25. 26 ..t > \ •! 3 i . I6 1 -^ <• ^/ r r
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