. Carnegie Institution of Washington publication. , 1004DF, 1216 53-14 b above • SSSo QQ27 F .61^^ I O8O7 (10) Dilute solu-tion. BCDE Same> as < .... •3309•3487 .^764 • BE, 509Cb, 514DF, 601 b above .•^824 .6702 F .4088 .7261 * Circles. 104 THE INTERFEROMETRY OF same trough but with different solutions, dilute and nearly place the trough normal to the beam, the reflection of the latter fromthe face of the trough was made to coincide with the spot on the is inadequate for fine work, but the interferomet
. Carnegie Institution of Washington publication. , 1004DF, 1216 53-14 b above • SSSo QQ27 F .61^^ I O8O7 (10) Dilute solu-tion. BCDE Same> as < .... •3309•3487 .^764 • BE, 509Cb, 514DF, 601 b above .•^824 .6702 F .4088 .7261 * Circles. 104 THE INTERFEROMETRY OF same trough but with different solutions, dilute and nearly place the trough normal to the beam, the reflection of the latter fromthe face of the trough was made to coincide with the spot on the is inadequate for fine work, but the interferometer method of retro-gressing fringes is not applicable unless the trough is separately the data obtained the constant B was computed from pairs of Fraun-hofer lines, B and E, C and b, D and F. Apart from the effect of the thick-ness e, it should be correct in case of the solutions to about a few tenths percent. In case of the concentrated solutions, however, the ellipses alreadybegin to move sluggishly and are much 48 50 52 54 56 58 60 6& 64 66 68 70 From ju— I + and B, the corresponding indices of refraction in table 27are easily computed; but these data are of little value here, because the thick-ness e of the ordinary plate-glass used is not constant to the degree is, however, worth while to exhibit the B for the different mercury-iodide solu-tions in terms of either /t or, what is equally serviceable and more convenient,in terms of JLI—i-f-K; for this quantity is directly given by the displacementmeasurement &N/e. If we regard the mean B for the B to E lines, and C tob lines as applying to the D line, the coordinated values are: (2) (4) (8) (9) (10) H-i+K JSXio11 15-63 4°-99 For solutions of small concentration the ratio of B and p—i+K changesbut slowly (29 to 34) as shown in figure 69, so that B may be predicted fromthe latter, always remembering that our equatio
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