The “NitroKen” Nitrogen Tube
Two electrode tube:
cathode and anti-cathode No independent anode.
long. 7” (17.5cms) bulb, made by the “X-RAY TUBE Co. N.Y.”, with
patent dates 1911, 1912, 1913 and 1915 etched on the side and the back of the
anode. Tungsten target, embedded in copper.
a description of this tube and of its regeneration device by Sinclair Tousey,
MD, from his book “Medical Electricity, Röntgen Rays and Radium” 3rd
Edition, W.B.Saunders Co., 1921, p768:
“….The residual gas is nitrogen and this
is also liberated from the materials in the regulator when the vacuum is to
be lowered. Experiments by A.Mutscheller (Principles for the use of
Röntgen Rays, New York, 1917) show that nitrogen shows the least
tendency to combine with the electrode metals most commonly used, and it is
selected therefore as the residual gas for the NitroKen tube. This shows a
dense yellowish-green fluorescence. Its regulator contains nitrites of
thorium, aluminium and barium which when heated liberate nitrogen, and they
tenaciously hold other gases such as oxygen and hydrogen.
In regulating, if the vacuum
becomes a little lower than normal the current passes through the vacuum to
a wire leading to the anode, and no longer through the regulating
The NitroKen tube is claimed to be
practically inexhaustible, but an inconvenience is that the vacuum always
becomes too high after exposure and requires reduction when used again. The
advantages claimed are great constancy of vacuum during prolonged or heavy
exposure and that no seasoning is required”.