Astronomical Photography

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Aug 1893

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1893natur..48..391r&link_type=abstract

Nature, Volume 48, Issue 1243, pp. 391 (1893).

Astronomy and Astrophysics

Astronomy

Scientific paper

THE announcement (NATURE, August 10), that it is in contemplation to raise a sum exceeding #2000 for the establishment of a special photographic telescope at the Cambridge Observatory, leads me to ask whether astronomers have duly considered the facilities afforded by modern photography. At the time of my early experience of the art, thirty-five years ago, it would have been thought a great feat to photograph the Fraun-hofer lines in the yellow or red regions of the spectrum, although even then the statement so commonly made that chemical activity was limited to the blue and ultra-blue rays was quite unwarranted. With the earlier photographic processes the distinction was necessary between telescopes to be used with the eye or for photography. In the former case the focal length had to be a minimum for the yellow rays, in the latter for the blue rays of the spectrum.

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