. Electrical news and engineering. ze, 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 o
. Electrical news and engineering. ze, 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 little heavier thanniiglit appear necessary in comparison witli ihc twin-circuittype. Tata Hydro-Electric CompanyTurning from American to European practice, it is inter-esting to survey two modern high-tension transmission lines,designed and constructed by an firm. The first ofthese is the Tata Hydro-Electric Company, operating be-. Fig. 21. Heavy river crossing tower, on the Tennessee Power Company. Copper cables strung on Ohio Brass strain insulators. Fig. 22. Double-circuit anchor tower, on the Tennessee Power transmission line. tween Khopoli and Bombay, India. Power is generated at a1,700-foot liead in the Western Ghats, and conveyed 4:! milesto the city of Bombay, at 100,000 volts, .iO cycles. Tiie voltagehas been criticized as being very high for the short distance,but tlie intention is to extend this system considerably as soonas the load develops. Furthermore, it is believed by sometransmission engineers that upon leaving the range of the pininsulator there is no wisdom or economy in operating belowthe 100 kilovolt figure. The ipower transmitted per circuitamounts at present to 25,000 , and the conductors are ofseven-strand copper, 121,000 cm., strung upon spans of 500feet, with steel towers. Tlie standard tower lias a narrowbase, but the line is reinforced at inter
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