. Development and electrical distribution of water power . hould not be less than 40 years. The edgesof all planks were bevelled so as to give J-inch opening on the in-side of the joint, which is calked with ship chandlers bottom seams were covered with hot asphaltum, and i-inch X6-inch redwood battens were nailed down over them. On the sides of these flumes a specially designed batten isused. This is of i-inch X 6-inch redwood, the upper half beingcut away on a curve, permitting asphaltum to be poured be-tween the batten and the side of the flume. At the corners ofthe flumes a quart
. Development and electrical distribution of water power . hould not be less than 40 years. The edgesof all planks were bevelled so as to give J-inch opening on the in-side of the joint, which is calked with ship chandlers bottom seams were covered with hot asphaltum, and i-inch X6-inch redwood battens were nailed down over them. On the sides of these flumes a specially designed batten isused. This is of i-inch X 6-inch redwood, the upper half beingcut away on a curve, permitting asphaltum to be poured be-tween the batten and the side of the flume. At the corners ofthe flumes a quarter-round strip is nailed. KERN RIVER PLANT 273 The design of the flume above described has been thorough-ly tested; and even if it should remain dry for months in the hottestweather, its designers state that it may again be filled with waterwithout having any perceptible leakage. In some cases, where crossing streams that are apt to carryconsiderable water in winter, span flumes are constructed. In connecting the wooden flume with the portal of a tunnel,. Fig. 146.—Wooden Flume. use was made of a construction of a special nature, which offeis two points of contact between the wood and the concrete, and a well between the two, from which the water may be pumped out, and any leaks repaired should these ever occur between the wood and the concrete. St eel-Concrete Flume.—The flume between tunnels No. 6 and No. 7 across Laird Canyon is constructed of structural steel and concrete. The whole structure is carried on 15-inch steel I-beams set 8 feet 10 inches apart and supported by concrete piers. These18 274 DEVELOPMENT AND DISTRIBUTION OF WATER POWER longitudinal girders carry 9-inch steel I-cross beams set 4 feetfrom centre to centre, and on them is erected a framework ofstructural steel for the sides and bottom of the flume. Thelayers of expanded metal (ij-inch and 3-inch mesh) are used inconnection with this framework and, filled with concrete, formthe plates enclosing the fr
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