Meadowcroft, Wm. H. (William Henry), 1853- · New York : The American Technical Book Co · leaf 144
instantlyand thus cast no shadow of it upon the screen.As the graphite in the pencil is more opaque to The A B C of the X Rays. *33 the X rays they cannot pass throngh it so well,and for that reason cannot canse the fluorescenceof the crystals upon that part of the screen im-mediately in front of… … Fig. 32. therein the X rays would in like manner pene-trate the leather, and reach the fluorescent crys-tals and that portion of the screen which wasimmediately behind the leather would fluorescejust as if nothing were interposed. The coinsbeing made of metal would, however, interceptthe rays so…
X-rays
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