Abstract
I MAY state that in a lecture which I gave here on the evening of Tuesday last, the 25th ult., I showed to a large audience, by means of a sheet of barium platino-cyanide, rendered fluorescent by the Röntgen rays from a Crookes' tube, all the things referred to by Mr. Campbell Swinton in his letter in the last number of NATURE. The shadows of coins in a purse, and of a hand, were distinctly visible to the audience when placed behind screens perfectly opaque to ordinary light, and, though more dimly, even through a book of eight or nine hundred pages.
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GRAY, A. The Röntgen Rays. Nature 53, 413 (1896). https://doi.org/10.1038/053413a0
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DOI: https://doi.org/10.1038/053413a0
