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from | Encarta |  |
Crookes Tube |
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| Sir William Crookes constructed this forerunner of the modern television picture tube in the 1870s to investigate the properties of cathode rays. When the tube is evacuated and a high voltage applied, one end of the tube glows, caused by cathode rays striking the glass. Crookes placed small objects in his device, and found that these objects cast shadows in the glow at the end of the tube; from this he was able to conclude that cathode rays, now known to be electrons, travel in a straight line. | ||||||
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| Appears in these articles: | ||||||
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| Television; Cathode-Ray Tube; Crookes Tube; Cathode Ray | ||||||
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