. Carnegie Institution of Washington publication. REVERSED AND NON-REVERSED SPECTRA. 119 of the diagram. Thus, for instance, the distance apart of the bands shrinks from red to violet, and the ovals, etc., are only appreciably symmetric, because they occupy so small a part of the spectrum. The horizontal distribution of dark bands around the center is determined by variations e cos r and is not linear. Whether the long axes of the ellipses are horizontal or vertical depends. upon the slope of the lines r and v. Maxima and minima will not, as a rule, occur close together, though in certain wood
. Carnegie Institution of Washington publication. REVERSED AND NON-REVERSED SPECTRA. 119 of the diagram. Thus, for instance, the distance apart of the bands shrinks from red to violet, and the ovals, etc., are only appreciably symmetric, because they occupy so small a part of the spectrum. The horizontal distribution of dark bands around the center is determined by variations e cos r and is not linear. Whether the long axes of the ellipses are horizontal or vertical depends. upon the slope of the lines r and v. Maxima and minima will not, as a rule, occur close together, though in certain wood-grain-shaped patterns this seems to be the case. In conclusion, therefore, the main feature in modifying the type of inter- ference pattern is the varying thickness of the compensator. For oval types the preponderating lens is convex; for the hyperbolic type it is concave. Neither of these lenses is here appreciably affected in modifying the horizontal distribution of path-difference, because the dispersion of the grating requires a horizontally parallel system of rays. 68. Observation with lens systems on both sides.—The method shown in plan in figure 85 (L and L' convex lenses, G grating, M and N mirrors, telescope at T} was tested. The outcome can not at once be foreseen, since the focal distances for different colors is different and since slight displacements of either lens must greatly modify the interference pattern. The latter, however, as obtained in every case, proved to be exceedingly fine lines, tipping in the. 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
Size: 1383px × 1807px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
