"The American scientist William Coolidge patented his 'hot cathode' tube in 1913. Its cathode was a heated, electron-emitting, tungsten filament. This solved many of the problems of the old 'gas tubes'. It produced a much higher output of x-rays which did not fluctuate and could be easily adjusted. In combination with more reliable power supplies, it allowed x-ray techniques to become standardized and reproducible"1.
- Photos by ti.supmacinu|ihgrob.l#ihgroB acuL (August 2011), courtesy of the Science Museum.
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