"Villard Valve"
This type of pear-shaped tube was used to regulate the current in the right direction through an x-ray tube, from the anticathode to the cathode. This electric valve, which was introduced in 1899, is named after its inventor: the French physicist and chemist Paul-Ulrich Villard (1860-1934).Nice laboratory model in very good condition, with an old label without mention.
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