Crookes Tube With Three Anodes
When the high voltage is applied, the cathode rays leaving the cupped cathode form three beams—one beam going to each anode as indicated in the drawing above left. The beams are visible due to the fluorescence of the gas molecules caused by the electrons traveling through the tube.
The age of this tube is uncertain, possibly late 1800s but more likely early 1900s.
Size: Approximately 14" high (including base) with 5 1/2" bulb diameter