Meadowcroft, Wm. H. (William Henry), 1853- · New York : The American Technical Book Co · leaf 141
ate of calcium has been reduced in cost sothat it can be purchased at about one-ninth ofthe price of platino-cyanide of barium. To Mr. Edison should also be ascribed thecredit of making the practical device known asthe Fluoroscope, by means of which these fluo-rescent salts can bepractically used… … Fig. 31. .Leaving out of consideration for the moment The ABC of the X Rays. 13 r the question of size, the fluoroscope may be de-scribed as a tapering box provided at one endwith an opening edged around with some softdark-colored material into which the upper partof the face will fit closely and…
X-rays
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