|Welch Scientific Geissler 'Aurora' Tube
|Written by AnubisTTP on 2007-06-18
This is a post WW2 Geissler tube that was manufactured specifically for the educational market. Though most Geissler tubes are typically highly decorated, this particular example is somewhat unusual due to its completely unshaped and undecorated envelope, which was designed to allow students to observe the flow of the gas discharge under different external magnetic and electrical fields. This can be seen in the photo to the right, the 'dark space' at each electrode is clearly visible, as are the standing waves produced by the high frequency power supply used for the photo. Though this tube was sold by Welch Scientific, we are almost certain it was actually manufactured by Electro-Technic Products sometime between 1960 and 1980 based on it's shape and electrode construction.
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Geissler tube powered to 1000 volts.
Many glow shapes are possible by altering the frequency and placement of power supply connections.