Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 343
e, excitedfrom an induc-tion coil, WilliamRoentgen, ofGermany, dis-covered that asensitized photo-graphic plate,concealed fromdaylight, butlying near thevacuum tube, in-dicated exposure to light when developed. Upon furtherinvestigation he found that a light was emitted from thevacuum tube, not… … Fig. 292.—Radiograph or the Human Foot in a Shoe.Made by Roentgen rays. THE INDUCTION COIL. 325 capable of producing rays of this light, it penetrates themwith different intensities, according to their density, so thatthe sensitized plate, upon development, shows the shadows of the objects…
Electricity · Magnetism
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