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  • Light emitted by Röntgen Ray Tubes: the letter "X" and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: the letters "X" and "D". Photoprint from radiograph, by James Wimshurst, 1898.
  • The Electrical Vacuum Tube: W.D. Ross demonstrates its medical use with a woman patient. Photograph, ca. 1922.