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Spectrum of the Aurora Borealis

✍ Scribed by DARROW, K. K.

Book ID: 115374714
Publisher: Optical Society of America
Year: 1923
Weight: 69 KB
Volume: 7
Category: Article
ISSN: 0030-3941
DOI: 10.1364/JOSA.7.000656

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## CURRENT TOPICS. 425 As advantages it is claimed that but a single image is necessary for photography in colors, that the same film permits projection in black and white or in colors, that the simplicity of the process makes it accessible to all, that commercial photographic and projection appar