Abstract
THE blue colour of the sky has as much action on an ordinary sensitive plate as the white colour of light clouds (cirrus and cirro-cumulus); it is therefore necessary to diminish the action of the blue background of the sky. For this purpose a yellow screen is placed so as to intercept the rays; the light coming from the sky contains very few yellow and green rays, and is thus extinguished to a great extent; but, on the other hand, the great proportion of yellow and green rays which exists in the white light of the clouds passes the screen and makes an impression on the plate, if it has been made more sensitive to the action of yellow and green rays than the ordinary plates.
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By M. Angot . (Translated from Cosmos, November 23, 1895.)
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Amateur Cloud Photography1. Nature 53, 230–232 (1896). https://doi.org/10.1038/053230c0
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DOI: https://doi.org/10.1038/053230c0