. Journal of electricity, power, and gas . and the net area of cross-section is 225 square ft. Two concrete bulkheads were erected to plug theunused end of the original tunnel. The first of theseis directly at the junction with the new section and isgiven a curved surface, making a smooth turn fromthe old to the new sections. Through this bulkheadare a number of small pipes, allowing water to passto the other side, thus relieving it of the first bulkhead is a second. This is 25 and is the true plug. Through this, two pipes, each equipped with two gate-valve
. Journal of electricity, power, and gas . and the net area of cross-section is 225 square ft. Two concrete bulkheads were erected to plug theunused end of the original tunnel. The first of theseis directly at the junction with the new section and isgiven a curved surface, making a smooth turn fromthe old to the new sections. Through this bulkheadare a number of small pipes, allowing water to passto the other side, thus relieving it of the first bulkhead is a second. This is 25 and is the true plug. Through this, two pipes, each equipped with two gate-valves, wereinserted. These are for drainage, should the neces-sity arise. The accompanying view shows the sectionof the old tunnel, between the plug and the section has not been altered. The plug can bedistinctly seen. the tunnel under pressure, with theultimate surface of the river 140 ft. above the mouthof the tunnel, necessitated an unusual construction April 9, I9I0] JOURNAL OF ELECTRICITY, POWER AND GA§ 319. Outlet of Old Tunnel in Dark Canyon. for the control of the intake flow. Combined with thisfact was the advisability of taking- water as near itssurface as may be possible, to eliminate sand, which
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
