Carbon electrodes for an ultraviolet arc lamp for use in a light

Electric lamp and discharge devices – Electrode and shield structures – Composite electrodes or shields

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13 18, 314 60, 313311, 313354, 313355, H01J 102, H01J 114, H01J 138, H01J 148

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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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