Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 305
vacuum 255» When tubes are exhausted to a high vacuum, their glass walls become beautifully phosphorescent, but with this exception they remain almost dark. When articles, whether transparent or not, are interposed inside of the tube and in front of the cathode, then shadows are sharply projected… … Fig. 141. Roentgens rays 256. Professor William Conrad Roentgen of Wuertzburg,Bavaria, discovered in 1895 that a current passing throughhighly exhausted Crookes tubes, generated invisible rays ELECTRICAL ENGINEERING 303 possessing peculiar qualities. Such rays pass freely throughaluminum and zinc,…
Electrical engineering
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