File:Bell telephone magazine (1922) (14570039739).jpg

Identifier: belltelephonemag18amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
ts at splices, which have frequently constituted aserious difficulty with steel wire in the past when the twistedjoint was used. Economies of Long-Span Construction When conditions permit straightaway runs, use of the newwire saves from 10 to 15 poles per mile. The loads which ruralline poles are called upon to withstand are relatively small and,generally speaking, the diameter of the pole needed for ade-quate strength is about the same whether long spans or shortspans are employed. Therefore, these savings in the numberof poles required with long span construction are virtually netsavings. Economies in pole maintenance are also effected byreduction in the number of poles, and the effects on conserva-tion of pole timber are not to be overlooked. In speaking of timber conservation, mention should be madethat all but a small percentage of poles which are being intro-duced into the Bell System plant are treated with wood pre-servatives before installation. With the recent advances in 238
Text Appearing After Image:
Fig. 1. Rural Constructiox with 400-foot Spans on Private Right-of-Way Fig. 2 Long Spax Rural Lines AlongHighways. Distances betweenPoles in the Line at the RightAre about 350 Feet, whileThose in the Line below Rangefrom That up to 425 Feet. Fig. 3

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