Page:The evolution of worlds - Lowell.djvu/273

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The Evolution of Worlds 0273.jpg

Spectrogram of Saturn—Photographed by Dr. V. M. Slipher, Lowell Observatory, October 11, 1904. Exposure 4h on "27" gilt edge plate. Long camera placed beneath the slit. Titanium comparison spectrum. Enlargement by Mr. C. O. Lampland.