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  • Discharge tubes- various types of anode and cathode.
  • Discharge tube with anode in shape of Maltese Cross
  • Discharge tubes- various types of anode and cathode.
  • Geissler tubes of complicated design.
  • Geissler tubes.
  • Light emitted by Röntgen Ray Tubes: letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: blurred letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • Light emitted by Röntgen Ray Tubes: blurred letters and shapes. Photoprint from radiograph, by James Wimshurst, 1898.
  • 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.
  • Arthur Radiguet making a radiograph (x-ray) of a recumbent man. Photograph by Radiographie Radiguet, ca. 1898.
  • Arthur Radiguet about to make a radiograph (x-ray) of a recumbent man. Photograph by Radiographie Radiguet, ca. 1898.
  • The Electrical Vacuum Tube: W.D. Ross demonstrates its medical use with a woman patient. Photograph, ca. 1922.
  • Electricity in the Service of Medicine.