File:Pacific Gas and Electric magazine (1914) (14595769009).jpg

Identifier: pacificgaselectr61915paci (find matches)
Title: Pacific Gas and Electric magazine
Year: 1909 (1900s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Public utilities
Publisher: (San Francisco, Calif.) : Pacific Gas and Electric Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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ingneedle valve or gov-ernor mechanism,but just controlledby a plain 10-inchgate valve. The sec-ond unit added bythe government hasan adjustable belt-tightener as well as amodern Pelton gover-nor equipment. The4-wire 2300-volt linesleave the station ona very neat system ofline and pole con-struction. Outdoortransformers stepdown the voltagefrom 2300 to 112-220volts. T h e t w oswitchboard panels,installed in 1902 byHenshaw-Hulkeley &((>., are neatly ar-ninged and are pro-\ ided for metering(111 tlie high side. The pipe line isi;i()0 feet long andhas a pressure of hol)ounds per square inch at the 3-inchentering nozzle to the walcr-wliccl cas-ings. Tlie riveted steel pipe is graduatedin step diameters from an initial of30-inch, then 20-inch, down to 10-inclinearer the power-house. The accompany-ing views show the supply of water inthe Merced just above the dam, also theconcrete dam with shut-ofF gate for con-trolling water down the pipe-line. This 222 Pacific Service Magazine «1
Text Appearing After Image:
Ul llR Ml-lTCli iliul UliloUl-Ue 11\ IIS Jll.sl above tlie pu..<;i-....uo. V....... -, -.-.- (Ill T-uiile bed slKiwing concrito anchor; :i, concrete dam and regulatingvalve; I, Yoseraite power-house almost hidden In the trees. Pacific Service Magazine 223 line has an excellentscreen over the in-take pipe and grizzlj-arrangement aheadof that, and it hassufTicient air valves,besides having sub-stantial concrete an-chors for securingthe same in the smallrugged canjon thatguides the pipe tothe power plant. Thedifficulty of runningthese two water-wheel units in paral-lel is somewhat ofa problem, but bystarting the regu-lated unit first andthen synchronizingthrough the alternat-ing current generat-ors the control of thesecond water-wheelcan be secured. Itis, however, a bit ofoperation that is outof the ordinary. Having investigat-ed the power-house,the trip through the Le Conte MemorialLodge, Yosemite cemetery and the In-dian Vilhige supplies sufficient interest looccupy the afternoon. T

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