The Face of the Moon

Enlarged image

Rutherfurd in 1864 had built the first refracting telescope with an "actinic" rather than a visual focus, which is to say it was designed specifically for the violet light waves (the actinic or chemical rays) that affect the photographic plate, rather than the waves to which the human eye is receptive. The photograph exhibited here was taken at Rutherfurd's observatory in New York City on September 16, 1870.

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