Heated-cathode X-ray tubes
Time: 1920
Place: United Kingdom
Details: In 1904, John Ambrose Fleming invented the thermionic diode, the first kind of vacuum tube. This used a hot cathode that caused an electric current to flow in a vacuum. This idea was quickly applied to X-ray tubes, and hence heated-cathode X-ray tubes, called "Coolidge tubes", completely replaced the troublesome cold cathode tubes by about 1920.
‹ Earlier in historyBritish Parliament passed the Restoration of Order in Ireland ActMonday Aug 9, 1920 Later in history ›Treaty of SèvresTuesday Aug 10, 1920
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