Abstract
RECORDS of the actinic value of daylight are being regularly taken in connexion with the ‘Jeremiah Horrocks’ Observatory, Preston. Strips of sensitised paper carried on a rotating drum pass close behind a narrow slit through which light from the sky enters; the apparatus is set up so that the slit opening is fed with light from an area of the sky 45 degrees square, the centre of the area having an altitude of 45 degrees above the horizon toward the north.
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GIBBS, G. Records of Actinic Value of Daylight. Nature 128, 35 (1931). https://doi.org/10.1038/128035c0
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DOI: https://doi.org/10.1038/128035c0
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