Electrode
The terminals
of a luminous tube from which the discharge emanates. They are made
up of the following:
1.
The electrode shell, which supplies current to the gas within the
vacuum. The metal used for this must be pure. Iron is the most common
metal used.
2.
Two lead-in wires, which connect the electrode shell to the high voltage
cable through a glass seal which keeps the vacuum intact.
3.
A glass jacket and seal which surrounds the lead in wires and encloses
the electrode shell in a cylinder of glass open at one end. This is
spliced to the tube.
4.
A heat-insulating material such as mica within the glass jacket, which
prevents the electrode shell from touching the glass wall.
![](img/electrode2.jpg)
Reproduction
of U.S. Patent No. 1,125,476 Issued to Georges Claude in January,
1915 Photographed by Shani Whitbread
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