Abstract
IN answer to Mr. Ranyard (NATURE, vol, x. p. 205), I have to state that the opaque bar in my experiments was placed as close to the collodion as possible without touching it, not farther than.01 in. from it, and that there were no photographic traces of diffraction bands.
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AITKEN, J. Photographic Irradiation. Nature 10, 222–223 (1874). https://doi.org/10.1038/010222b0
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DOI: https://doi.org/10.1038/010222b0
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