Chabaud Tube
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Cold cathode tube by Victor Chabaud.14” (35 cms) long, 4”(10 cms.)
bulb, with an engraved inscription “V.Chabaud, Date of manufacture uncertain. Probably around 1905. Regeneration is by the Villard osmo-regulator. This tube has only two electrodes, the aluminium cathode and the
platinum anode serving as an anti-cathode. Note the peculiar conical shape of the anode structure, with the flat
target on the posterior internal wall of the cone, facing a round anterior opening
through which passes the electron beam. The generated x-rays come out of the
cone by its wide inferior opening. This tube is probably the oldest known
with a hooded anode. |
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“ ……. Of the tubes with small bulbs, that of Chabaud is
probably the best. The bulb is about
4” diameter.…..is made with great care in every respect, and all
metal parts, excepting, of course the cathode, are made of pure
platinum. It is provided with an
osmo-regulator which can be warmed while the tube is working, and so long as
its maximum current is not exceeded, it can run continuously for hours. Though the first cost is high, in practice
it is one of the most economical and reliable. It is admirably adapted for x-ray
treatment, and radiography of the thinner parts of the body. The remarkable
feature of this tube is that in normal conditions of working - passing about
0.5 milliampere when new, but
rather more when old - the
anode is at a red or nearly white heat, and shows
little tendency to get softer with the increase of temperature”. (Edward Reginald Morton - “A Textbook of
Radiology”, 1918, p.50) |
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