. Carnegie Institution of Washington publication. REVERSED AND NON-REVERSED SPECTRA. 53 fringes may be made to vanish under inverse conditions. Table 4 shows their close relation to the preceding colored set, so far as motion of the micrometer is concerned. TABLE 4. Ives grating. 15,050 lines to inch, computed 5e= cm. per fringe. io35e= cm. (large fringes) io36e= cm. (small fringes) .80 •77 .80 Wallace grating. Wide slit. Coincident Na lines. Fringes in principal focus, very clear and strong. io3de= cm. io3<5e= cm. ,, Mnges |;:;7' Wallace grating. Wide sl
. Carnegie Institution of Washington publication. REVERSED AND NON-REVERSED SPECTRA. 53 fringes may be made to vanish under inverse conditions. Table 4 shows their close relation to the preceding colored set, so far as motion of the micrometer is concerned. TABLE 4. Ives grating. 15,050 lines to inch, computed 5e= cm. per fringe. io35e= cm. (large fringes) io36e= cm. (small fringes) .80 •77 .80 Wallace grating. Wide slit. Coincident Na lines. Fringes in principal focus, very clear and strong. io3de= cm. io3<5e= cm. ,, Mnges |;:;7' Wallace grating. Wide slit. Non-coincident Na lines. io35e= cm. io3de=i.^8 cm. (small fringes) (large fringes) The fringes decrease in size as e increases and exhibit the same irregularity of Se values, due, no doubt, to the same causes (equation 6). Moreover, be is here below the normally computed value, supposing the angle i to be negli- gible. In fact, figure 36 shows the optical center of the collimator C; so that 37. 36 Ca and Ca' are the axes of parallel pencils, diffracted by the gratings G and G' at the angles 6 for Ca and tf for Ca'. The rays are subsequently condensed at F, the focus of the telescope, L being the principal plane of the objective. The general path-difference is thus, by equation (5), e(i— cos (0'+*))/cos i, which distributes the fringes from right to left with variation of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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