Symposium on operative of the boulder dam transmission line-insulation and lightning protection

This paper covers a r??sum?? of the fundamental principles of insulation and lightning design for the Boulder Dam transmission line, including the fog problems encountered in the coastal regions and the lightning problems of the desert section. The operation in both areas is covered, with particular reference to the lightning encountered during two years of construction and one year of operation. A description of the lightning recording equipment with current values and frequency of strokes is reported. From these values the adequacy of the design is definitely indicated.