Abstract
I HAVE once or twice been asked why photographs are apt to show a line or band or edging along the boundary of a bright and dark region. My assistant, Mr. E. E. Robinson, has thought of the reason, and it may be convenient to publish it. In a developed film the exposed portion perceptibly differs in thickness from the unacted-on portion, and accordingly the linear boundary of two contrasted regions may sometimes act as a cylindrical lens, and during printing either concentrate of disperse the light on the positive immediately beneath it.
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LODGE, O. Border occasionally seen between Light and Dark Regions on Photographic Prints. Nature 73, 5 (1905). https://doi.org/10.1038/073005c0
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DOI: https://doi.org/10.1038/073005c0
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