Abstract
HAVING seen in NATURE several letters on the above subject recalls to my mind some experiments made by me two years ago. I first observed it after developing X-ray plates, and mentioning the matter to Prof. Poynting, of the Birmingham University, he advised me to pursue the subject further.
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CLARKE, W. Phosphorescence of Photographic Plates. Nature 69, 366 (1904). https://doi.org/10.1038/069366a0
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DOI: https://doi.org/10.1038/069366a0
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