Villard Tube (1898-1905) |
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This cold cathode x-ray tube employs Villard’s osmosis method of
regulating the tube’s internal gas pressure. To correct for the
gradually decreasing pressure inside the tube, the fine platinum/palladium
capillary (protected by the small glass test tube projecting out from the
side of the x-ray tube stem) was heated in a flame. Hydrogen gas diffused
through the platinum/palladium into the tube to increase its pressure.
Manufactured by the Emil Gundelach company in Gehlberg Germany. The company’s logo, a scale hanging from the inside of a large "G," can be seen etched on the stem of the tube. |
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