Early Gundelach Tube (1898-1905) |
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When necessary, the gas pressure was increased by using a flame to heat
the small (ca. 2" long) tube extending from the stem of the main
tube. The heat released small quantity of gas trapped in the chemical
located at the tip of the small tube. Note the simple design of the
anticathode. Its small mass made it unsuitable for continuous operation
(due to overheating).
Manufactured by the Emil Gundelach company in Gehlberg Germany. The company’s logo, a scale hanging from the inside of a large "G," can be seen etched on the stem of the tube. Donated by Bill Kolb |
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