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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.
Reproduction
of U.S. Patent No. 1,125,476
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