. Carnegie Institution of Washington publication. inges with a single film grating. REVERSED AND NON-REVERSED SPECTRA. 33 At these extremes the two patches of light on the grating G may havebeen separated by several millimeters. The nature of the transformationfrom arrows to the oblique striations would be well reproduced if equidistantvertical wedges were moved from right to left, or the reverse, behind avertical slit. The distance between G and G was about cm., and between the spotsof light on mirror M and gratings G and G, respectively, and corresponds to 01 = ° a
. Carnegie Institution of Washington publication. inges with a single film grating. REVERSED AND NON-REVERSED SPECTRA. 33 At these extremes the two patches of light on the grating G may havebeen separated by several millimeters. The nature of the transformationfrom arrows to the oblique striations would be well reproduced if equidistantvertical wedges were moved from right to left, or the reverse, behind avertical slit. The distance between G and G was about cm., and between the spotsof light on mirror M and gratings G and G, respectively, and corresponds to 01 = ° and 02 = °, so that 6= ° and o- = °. It is obvious that if the slit of the collimator is displaced right or left, therange of displacement, within which the interferences lie, will have differentpositions on the micrometer, because the path-differences are changed. Aflickering arc may also introduce annoyances. The present method has an advantage for ordinary practical purposes, asit does not require a ruled-glass grating at G. 20.
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