Abstract
As an amateur photographer of cloud-scenes, I have taken the image of the setting sun surrounded by clouds on many occasions. I never remember developing a plate in which the image was reversed after an ordinary rapid exposure. Lightning flashes, one would think, ought to be still more rarely reversed, if the chemical reactions of the salts in the gelatine film are solely responsible for the phenomenon; yet dark lightning flashes are not infrequently visible in the developed plates of a thunderstorm.
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HOLLIS, W. Dark Lightning Flashes. Nature 61, 7 (1899). https://doi.org/10.1038/061007a0
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DOI: https://doi.org/10.1038/061007a0
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