Electric lamp and discharge devices – Electrode and shield structures – Composite electrodes or shields
Patent
1975-12-19
1977-02-01
Chatmon, Jr., Saxfield
Electric lamp and discharge devices
Electrode and shield structures
Composite electrodes or shields
13 18, 314 60, 313311, 313354, 313355, H01J 102, H01J 114, H01J 138, H01J 148
Patent
active
040063798
ABSTRACT:
Upper and lower carbon electrodes for an ultraviolet arc lamp used for light-fastness testing. The upper electrode is in the shape of an elongated cylinder, the cross-section of which has an exterior annular portion consisting of a carbonaceous material and an interior core portion consisting of a mixture of a carbonaceous material and potassium sulfate. The upper electrode has dispersed therethrough potassium chloride as a stabilizing agent. The lower electrode is in the shape of an elongated cylindrical tube having a hollow interior and is of a carbonaceous material having a high electrical conductivity and has dispersed therethrough potassium chloride as a stabilizing agent. When the upper and lower electrodes are placed with their ends opposed to each other and an alternating current at 135V and 16A is discharged thereacross, a stable light is continuously produced.
REFERENCES:
patent: 1186253 (1916-06-01), Wilcox
patent: 2185679 (1940-01-01), Parisot
patent: 2229227 (1941-01-01), Simon et al.
patent: 2282533 (1942-05-01), Simon et al.
patent: 3313976 (1967-04-01), Lauzau et al.
patent: 3461339 (1969-08-01), Robiette
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