ly it exceeds The cables are supported in the great span by two installation, to long-continued tests of 120,000 volts. all previous performances of the kind will be appreci- steel towers. The one on the bluff, known as the There is an extreme variation in temperature of 60 ated when it is stated… … during the year of five feet in the sag of the cables, the gradually rising ground opposite is 64 feet high, such construction was found in a sheer stretch of a difference which will cause a travel of fully two the latter structure being known as the “south” 1,500 feet of cable across the Columbia…
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