on the silver salts of photographic platesis exercised directly by the X Rays. It ispossible that this effect is due to the fluorescentlight which, as mentioned above, may be gen- FOR EVERYBODY. 37 era ted on the glass plate or perhaps on the layerof gelatin. Films may be used just as wellas glass… … figure 22. Prof. Wright experiments with a great varietyof substances and he found that strong impres-sions were obtained upon a photographic plateeven when it was enclosed in a wrapping ofblack paper and covered with a pine board halfan inch in thickness. 38 SOMETHING ABOUT X RAYS. Pieces of glass…
X-rays · Fluorescence
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