|Made by Emil
Gundelach robably between 1898 - 1903, this ion
x-ray tube requires a residual gas (hydrogen) to produce x-rays
and is sensitive to pressure variations inside the tube. Gas tubes depended
on collisions of positive ions with the cathode in order to knock off electrons
rather than boiling electrons of a surface. This is a high voltage dc x-ray
tube. The tube measures 14" long and is 6" in diameter at its largest point.
The cathode is at the bottom, the anode
is at the top, and the anticathode
is inbetween at an angle of 45 degrees. If the tube stopped working due
to low gas pressure, the osmo regeneration
mechanism was used to re-pressurize the tube.
Why three electrodes?
|The Gundelach symbol, a capital
"G" with a scale in the middle.
|"D.R.P. No 103109" German patent #103109 was issued in late 1898.|
|The department inventory number D125E|
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