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 640
aof hydrogen. ROENTGEN RAYS AND OTHER RAYS 571 385. Phenomena in high vacua. Sir William Crookes foundthat when the exhaustion of a tube is carried to a very highdegree the dark space separating the negative glow from thecathode increases in width; andthat electrified particles are pro-jected in… … part of the air remains (i.e., the Fig. 425. — Shadow formed bycathode rays. pressure is about 0.0001 of a milli-meter of mercury), the dark space fills the entire tube and theglass walls become beautifully phosphorescent. If a body(whether opaque or transparent) is placed infront of the cathode, a…
Electricity · Magnetism
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