. Carnegie Institution of Washington publication. cos R CS2E/cos R TotalE ±E+e/cos R dx dNc de dNcobserved. de dNc com-puted. Glass+ +glassGlass cm.+ too. s •735 715 Q 7-ic 3363126 6 5 3-7 6 * Glass— glassGlass— glass •wyc)•695•695 . •/GO •735•735 . •/OO .488 •173 182500 •O * Carnegie Inst. Wash. Pub. No. 229, 1915, p. 74 et seq., \\ 40, 41. In equations (13)and (18) d\/dNc and dO/dNc should be inverted and D cos 6 in the latter put in the numerator. REVERSED AND NON-REVERSED SPECTRA.
. Carnegie Institution of Washington publication. cos R CS2E/cos R TotalE ±E+e/cos R dx dNc de dNcobserved. de dNc com-puted. Glass+ +glassGlass cm.+ too. s •735 715 Q 7-ic 3363126 6 5 3-7 6 * Glass— glassGlass— glass •wyc)•695•695 . •/GO •735•735 . •/OO .488 •173 182500 •O * Carnegie Inst. Wash. Pub. No. 229, 1915, p. 74 et seq., \\ 40, 41. In equations (13)and (18) d\/dNc and dO/dNc should be inverted and D cos 6 in the latter put in the numerator. REVERSED AND NON-REVERSED SPECTRA. 129 If x is the displacement in centimeters in the ocular, 5 = ^, the denom-inator being the length of the telescope. The successive values of x in termsof N, the mirror displacement, are given graphically in figure 87 for the dif-ferent values of E = E-{-e/co$ R in question, and from them dd/dNc wastaken graphically. All the curves are appreciably straight, except the onefor £= cm., which is definitely 4 The values of dd/dNc observed and computed obviously agree as closelyas may be expected for mean conditions of the spectrum between green andred and of the mode of procedure. The small coefficient for carbon bisul-phide is, moreover, in keeping with its large value of B or high a sensitive displacement interferometer B like E D should all be small;but unfortunately this implies large ellipses. The beautiful small ellipsesobtained with the carbon-bisulphide plate are of little avail because of theirsluggish motion. In fact, the small thickness of the carbon bisulphide layerand the reduced coefficient observed are quite striking in comparison with ^lass. Moreover, since for an order n o dd i X2 dn 2 D cos <J (cos R + zB/\z cos R) — N the effect of a large B, though it reduces the general size of ellipses, does sobut slightly, since the term in B can not be more than a few per cent (3 to 6)of the other term in the bin
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