. Carnegie Institution of Washington publication. -3 -4* -5° -6°. 92 iO W 20 cm out all this work the achromatic fringes are also available for precision in N,but for this reason are more difficult to manipulate if individual fringes aretreated. They may, moreover, be much enlarged by rotating the mirror mand advancing the micrometer at H$ in small steps in such a way as to pro-duce contrary effects and thus keep the achromatic fringes in the field. Ifthe fringes leave the principal focus, the micrometer at Ha and its adjust-ment screws may be actuated together in the same way. This is the mos
. Carnegie Institution of Washington publication. -3 -4* -5° -6°. 92 iO W 20 cm out all this work the achromatic fringes are also available for precision in N,but for this reason are more difficult to manipulate if individual fringes aretreated. They may, moreover, be much enlarged by rotating the mirror mand advancing the micrometer at H$ in small steps in such a way as to pro-duce contrary effects and thus keep the achromatic fringes in the field. Ifthe fringes leave the principal focus, the micrometer at Ha and its adjust-ment screws may be actuated together in the same way. This is the mostavailable method for eliminating the glass-path, so that enormous spectrumellipses are obtainable. Finally, three groups of achromatic fringes (oneach side of the strong central group) were noticed, the distance apart ofgroups corresponding to about AN = cm. REVERSED AND NON-REVERSED SPECTRA. 133 It is obvious that 2AN cos i will increase with 2R, the distance apart ofthe parallel rays ae and bf, figure 88, as well as with the rotation a. But therelatio
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