Publisher's Synopsis
Excerpt from The Great Star Map, Being of Brief General Account of the International Project Known as the Astrographic Chart
From that of the amateur photographer he uses a much longer camera he drives the camera by clockwork so that it may follow the stars; and he takes pictures at night instead of in the daytime. It may per haps be added that he uses the light emitted by the stars, instead of photographing Objects by the re?ected light of the sun. But of these details more presently.
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