. Electrical news and engineering. onductors are 2/0 B & Scopper, and the spans 660 feet. The adoption of the two separate circuits is a valualilefactor in reliability. In the first place, the spacing can bemore liberal, thus quite eliminating corona loss and short cir-cuit. due to sleet juniip. The greater spacing frequently per-mits, a longer span being run. Furthermore, the design oftower is very compact; it has no great length of cross-arm,and its height is at least 20 feet less than that of the equiva-lent twin circuit tower. The disadvantages lie in the extracost of right of way and the
. Electrical news and engineering. onductors are 2/0 B & Scopper, and the spans 660 feet. The adoption of the two separate circuits is a valualilefactor in reliability. In the first place, the spacing can bemore liberal, thus quite eliminating corona loss and short cir-cuit. due to sleet juniip. The greater spacing frequently per-mits, a longer span being run. Furthermore, the design oftower is very compact; it has no great length of cross-arm,and its height is at least 20 feet less than that of the equiva-lent twin circuit tower. The disadvantages lie in the extracost of right of way and the higher costs of , where possible reliability is to be securedit is probable that two separate tower lines will in future beadopted. The same practice is adopted upon the highest volt-age transmission line at present in operation, that of the Pacific Light and Power Corporation This line sup]>lies tlie city of Los Angeles frinii the powerstation at Big Creek, in the Sierra Nevada, 241 miles Fig. 20. One of the semi-anchor towers, equipped with lock insulators, onthe Cedars Rapids Manufacturing and Power Companys transmission line. The present output per circuit at volts, 50 cycles, , but this is far from being the limit of the develop-ment. The conductors are of liberal size, being 605,000 , strung on 660-foot spans. The standard one-circuit tower weighs pounds. The reason for the some-what heavy construction lies in the large size of the cables andthe high elastic limit. Furthermore, it will be seen that a June 1, 1918 THE ELI-XTRICAL NEWS 29 siiiKk circuit tnwcr >li<iul(l he liMUrcd lu willistaiul llic fuikncnf two cal)lcs, or two-thirds of the conductors on (Uic side; atthe same time a doulile circuit tower is figured lor just thesame eventuality, wliich in tiiis case amounts to only one-third of the wires on one side. This is the reason for thesingle-circuit structure always lieing a li
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