. Carnegie Institution of Washington publication. zD'(N cos 25 22 dA JM /u, 4-' Y' 6- z> % &~ ~~nE <M. JL or 23 In case of a single grating cr/2 = 02=0 N = cos2 0 2 sin. 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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