Journal of electricity, power, and gas . rding to its use inthe various industries. May 9, 1914.] JOURNAL OF ELECTRICITY, POWER AND GAS 403 PROGRESS IN TRANSMISSION LINE CON-STRUCTION. BT A. S. KALENBORN. (In this article the author describes the construc-tion and characteristics of three parallel transmis-sion lines which, constructed at different periods,indicate in an interesting manner the developmentof transmission line practice.—The Editors.) A very interesting exposition of the progress thathas been made in the construction of high tensiontransmission lines is to be seen on the peninsul
Journal of electricity, power, and gas . rding to its use inthe various industries. May 9, 1914.] JOURNAL OF ELECTRICITY, POWER AND GAS 403 PROGRESS IN TRANSMISSION LINE CON-STRUCTION. BT A. S. KALENBORN. (In this article the author describes the construc-tion and characteristics of three parallel transmis-sion lines which, constructed at different periods,indicate in an interesting manner the developmentof transmission line practice.—The Editors.) A very interesting exposition of the progress thathas been made in the construction of high tensiontransmission lines is to be seen on the peninsula justsouth of San Francisco. Three parallel, high tension lines skirt the bayshore at a short distance eastward from the Southern? Pacific Railroad line down through the peninsula townsof S^n Bruno, Millbrae and Burlingame, Two of these lines are 60,000 volt construction onwooden poles belonging to the Pacific Gas & Elec-tric Company and the third is a 100,000 volt steeltower line of the Sierra and San Francisco Power These Three Dissimilar Lines Marking theof Development. March The accompanying half-tone shows the three linesas they appear from the car windows. The closely spaced poles are those of the oldStandard Electric Company and are square sawn red-wood 35 ft. poles spaced 40 per mile. This line was built around the bay in Januaryof 1901, so the line is now thirteen years old. (E. 39, p. 25). This was one of the pioneer linesin long distance transmission and was the end of a142 mile line. A composite insulator was used, a por-celain to,p cemented onto a glass center, which typewas soon replaced in the bay region by the larger,all porcelain four part insulator. Push posts were used at angles instead of guys,on account of there being no guy line insulator de-veloped to stand 60,000 volts. The triangle was 36 and 42 in. and frequent trans-positions were made in the line wires. For double construction at the pole top two largewooden brackets were bolted
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