. Journal of electricity, power, and gas . tor discs in series could, by making that numbersufficient, resist any voltage stress that might be im-pressed. The transmission line from the Big Bend power-house to Oakland embraces the results of the expe-rience of the earlier transmissions and is up to datein design and construction. It fulfills the require-ment that would have been impossible of accomplish-ment a decade past. There are an average of seven Milliken steel tow-ers per mile—1200 in all. In the mountain sections,the spaces between them vary, as the highest points ofground were natural
. Journal of electricity, power, and gas . tor discs in series could, by making that numbersufficient, resist any voltage stress that might be im-pressed. The transmission line from the Big Bend power-house to Oakland embraces the results of the expe-rience of the earlier transmissions and is up to datein design and construction. It fulfills the require-ment that would have been impossible of accomplish-ment a decade past. There are an average of seven Milliken steel tow-ers per mile—1200 in all. In the mountain sections,the spaces between them vary, as the highest points ofground were naturally selected. The height from the base plates to the extremetop is jy ft., 6 ft. being below ground. There arethree cross-arms of equal length placed one above an-other and ten feet apart. Once in every 3^ miles thereis a tower where the upper arm is attenuated to carryfour wires. This is for the purpose of transposition, orspiraling of the circuit, to neutralize effects of mutualinduction. ; —~ M \ 2 ?h/o . \, — > 1 ,| ! mppMnR. Special Transmission Towerfor Long Span. Standard Transmission-lineTower. Wherever rivers are crossed, special towers wereerected ta meet the conditions encountered; thesevary in height from 150 ft. to 290 ft., the latter figurebeing that of the towers spanning the lines over thedelta of the Sacramento River near Antioch. Inmarshes and other soft places, piles were first drivento give suitable foundation to the towers. From each end of the arms is hung the are of the Locke, Thomas and General Electrictypes, but all consist of four and five brown porcelaindiscs. These discs are fastened together by steel linksimbedded in and inter-connected from the upper andlower side of the porcelain in such a manner that if theporcelain should be shot away or otherwise broken, thelinks would remain fastened together. From belowthe lowest disc the wire is supported by a substantialclamp, held by one hook bolt, six being used wherestrain occurs.
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
