Gundelach Tube 1
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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