. Electrical world. ft. long on the river side that contains openingsfor the flush and waste gates. The waste gate opening is 4 ft. wide,of about the same height, and has its bottom approximately on alevel with the forebay floor at that point. The opening for the wastegate is 10 ft. wide, has its bottom 10 ft. above the forebay floor and7 ft. beneath the low-crest level of the dam, and extends to the topof the wall in which it is located, 5 ft. above the low crest of the stone masonry laid in cement mortar forms the head wallof the forebay, and this wall serves also as one side of t
. Electrical world. ft. long on the river side that contains openingsfor the flush and waste gates. The waste gate opening is 4 ft. wide,of about the same height, and has its bottom approximately on alevel with the forebay floor at that point. The opening for the wastegate is 10 ft. wide, has its bottom 10 ft. above the forebay floor and7 ft. beneath the low-crest level of the dam, and extends to the topof the wall in which it is located, 5 ft. above the low crest of the stone masonry laid in cement mortar forms the head wallof the forebay, and this wall serves also as one side of the wheelroom in the power station. On top the elevation of this wall is greater than that of the low crest of the dam, and its base runsdow n to a plain 20 ft. below that crest. At its top the thickness ofthis wall is ft., at the low-crest level of the dam, and the flowat line of the canal the thickness is 7 ft., and at the level of theforebay floor the thickness is ft. This wall is further strength-. FIG. 5.—HEAD GATES, G.\RVIN S F.\LLS. ened by buttresses that extend into the wheel room between thewheel cases. On its forebay side the head wall of the forebay is vertical and infront of this wall is the steel rack ft- long and 20 ft. in verticalheight, reaching from the bottom of the forebay to a line the low- crest of the dam. The face of this rack is 11 ^ in. from the face of the head wall at the bottom, and 6 ft. 10^in. at the top. In structure the rack is built up with 15-in., 42-poundsteel I-beams reaching from top to bottom and spaced with centers10 ft. 6 in. apart. At their lower ends these 15-in. beams are rivetedto a 20-in., 60-pound horizontal I-beam, and at their tops to a 15-in.,42-pound I-beam, while three other horizontal beams tie those runningup and down the rack together at intermediate points. The hori-zontal 20-in. I-beam at the bottom of the rack is set in a bed of con-crete and bolted to the natural ledge beneath. .
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
