Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 498
and moreparticularly in 1894 by Hittorf, and by M. Lenard, a Hungarian physicist,who found that they pass through thin plates of metal, and through woodand other substances not transparent to ordinary light. It was also ob-served by Lenard, and also previously by Hertz, that there are severalkinds… … Fig. 232^;.— Living Hand. Exposure^ 4 Minutes. But universal attention was drawn to this subject by the announcement,at the end of 1895, of certain discoveries made by Dr. W. K. Roentgen,a professor of physics at Wurzburg. He covered a highly-exhaustedCrookes tube with black cardboard, and found…
Inventions
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