An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 642
th a well-exhaustedCrookes tube (Fig. 428) which was covered by black card-board so that no ordinary light could pass from it to the room.Near by lay a sheet of paper covered with a chemical compoundwhich shines when struck by ether waves of high frequency.Crystals of tungstate of calcium possess… … Fig. 428. - Typical X-ray tube; a, cathode; b, c, anodessource of X rays; x, X rays. d, anticathode, and cast a shadow upon the paper. An investigation showedthat the effect was due to an hitherto unknown radiation pro-ceeding from the tube, and Roentgen or X rays were discovered.These rays or…
Electricity · Magnetism
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