. Carnegie Institution of Washington publication. d absence of the plate to be tested. In the case of liquids the empty and REVERSED AND NON-REVERSED SPECTRA. 101 the filled trough are similarly compared. Data of this kind for a dilute solu-tion of mercury-potassic iodide and two kinds of glass are given in table is the micrometer reading at M for the half-silvered plate alone. In caseof the solution, it is to include the glass plate of the trough. N—Na = AN. TABLE 25.—Dispersion constants. Fraunhofer XXio6 Na (i) vSolution.£ = cm- (2) Trough = cm. (3) Glass
. Carnegie Institution of Washington publication. d absence of the plate to be tested. In the case of liquids the empty and REVERSED AND NON-REVERSED SPECTRA. 101 the filled trough are similarly compared. Data of this kind for a dilute solu-tion of mercury-potassic iodide and two kinds of glass are given in table is the micrometer reading at M for the half-silvered plate alone. In caseof the solution, it is to include the glass plate of the trough. N—Na = AN. TABLE 25.—Dispersion constants. Fraunhofer XXio6 Na (i) vSolution.£ = cm- (2) Trough = cm. (3) Glass = cm. N-Na N-Na N-Na cm. B C 65-63 •0173 •1554 •3023 .2403 D .0220 .1622 •3065 .2436 E .0284 •1731 .3121 .2481 b 51-77 .0296 •1753 •3130 .2488 F .0342 .1851 •3171 .2520 The computed values n—i-{-K=(N—Na)/e = AN/e are given in the graphfigure 67 (series numbered), from which the characteristic difference in thedispersion of the solution and of the glass is If, now, the value of B is computed by equation (4), between successiveFraunhofer lines B—E, C—b, D—F, the results come out as in table 26 andthe coefficient B should be correct to about i per cent. For instance, in thecase of the solution (N—Na)\—(N—Na)\f = dN = , , , respectively. TABLE 26. Fraunhoferlines. (i) (2) Trough (3) B-EC-bD-F 4-50 102 THE INTERFEROMETRY OF It thus appears that in case of the solution the equation n=A-\-B/\z isfar from sufficient up to the Fraunhofer F line. Nevertheless even here themean of the first two results may be regarded as holding in the region of theD line. The large value of B as compared with the glasses is particularlynoteworthy, and from this a reason for the poor ellipses obtained with dilutesolutions is suggested. If for two media the AN/e are identical, as at a andb in figure 67, th
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