Abstract
IT seems to me difficult to compare the photographic brightness of the dise of the setting sun with a brilliant flash of lightning. For my part I consider that lightning flashes give us every chance of obtaining photographic reversals, for they can be photographed at very close distances, amounting to a few hundred yards, while the rays from the sun's disc when near the horizon must pass through a long range of dense atmosphere which cuts off the most actinic and therefore photographic rays.
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LOCKYER, W. Dark Lightning Flashes. Nature 61, 7 (1899). https://doi.org/10.1038/061007b0
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DOI: https://doi.org/10.1038/061007b0
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