Lightning investigation on transmission lines — IV

Lightning currents ranging from about 4,000 to 63,000 amp in the towers of electric power transmission lines have been measured by the surge crest ammeter; of 64 readings obtained, all but 2 showed currents of negative polarity. This paper is the fifth in a series by the same authors reporting the results of a continued investigation of lightning effects on several typical transmission lines in different parts of the United States.