The Crookes Tube was developed by English physicist Sir William Crookes to investigate the phenomenon of charged particles given off when a high voltage was connected across the tube and as the air was pumped from the vessel. Wilhelm Roentgen discovered X-Rays whilst experimenting with a Crookes Tube.![](../pics/abr0005e.jpg)
The different glowing regions possible in a Crookes Tube as the pressure varies. Image courtesy of Wikipedia.![](../pics/abr0005a.jpg)
One circular electrode and the evacuation pip. The support is not sheathed in glass.![](../pics/abr0005b.jpg)
The other circular electrode. The glass to metal seal can be seen on the left.![](../pics/abr0005c.jpg)
A close-up of one electrode. As a cold cathode device both electrodes are the same.![](../pics/abr0005d.jpg)
An X-ray image of the tube. The open tube at the top would be connected to a vacuum pump when in use.The wide glass tube envelope is 45 mm in diameter, and including the base pins is 425 mm tall.References: Observation Wikipedia & UK Science Museum. |
Updated July 21, 2014.
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