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 or before 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 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 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) |
