Pressler Ion Tube
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During the first half of the 20th
Century, the brothers Otto and Rudolf Pressler, in The above tube is undated. It is a two electrode tube (a concave aluminium cathode and a tungsten faced anti-cathode, without any other anodal structure). It is about 14”(35cms) long with a 4”(10cms) bulb, and bears the Pressler (Cursdorf) label, with a faded “No. 2520”. Of particular interest is the regeneration device, consisting of a small carbon inclusion freely moving in a small side-chamber communicating through a narrow neck with the main tube cavity. When the tube becomes hard with use, due to high vacuum, heating this carbon material liberates some of the adsorbed gas and the right vacuum is re-established. Note the glass sheaths surrounding
the stems of both the cathode and the anti-cathode and the small radial glass
arms fixing them in a constant position inside the tube necks. Nevertheless, in
this particular tube, the focal spot on the tungsten target is visibly off-center.. |
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