Abstract
CORONA in an electric system consists of minute arcs which produce ozone and nitrous acid in air; they carbonize oil, paper, and cotton; they oxidize and age rubber, and they corrode metal. Corona at operating voltages has often caused the rapid deterioration of the electric equipment containing the corona. In addition, high-frequency radiation is produced which may interfere with radio and allied instruments. For these reasons engineers working in the design and development of electric equipment should know the voltage at which corona first appears in that equipment.
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