. Electrical world. , 3^ ft. deep andis built on a grade of S ft. to 100 ft. The course of Fall Creek ditchlies almost entirely through rock of volcanic formation, and it beginsone mile above the upper falls of Fall Creek, from which it takeswater by means of a diverting dam 115 ft. long and 4 ft. high. Verylittle work was necessary to put in this dam, as all natural condi-tions were favorable to it. The Fall Creek ditch is 4,650 ft. long,being 6 ft. wide at the bottom, 5 ft. deep and 12 ft. wide at the top,built on a 5 per cent, grade. The velocity is 354 ft- per second, whichgives the ditch
. Electrical world. , 3^ ft. deep andis built on a grade of S ft. to 100 ft. The course of Fall Creek ditchlies almost entirely through rock of volcanic formation, and it beginsone mile above the upper falls of Fall Creek, from which it takeswater by means of a diverting dam 115 ft. long and 4 ft. high. Verylittle work was necessary to put in this dam, as all natural condi-tions were favorable to it. The Fall Creek ditch is 4,650 ft. long,being 6 ft. wide at the bottom, 5 ft. deep and 12 ft. wide at the top,built on a 5 per cent, grade. The velocity is 354 ft- per second, whichgives the ditch a capacity of 2,000 miners inches. The only piece lengths, the enumeration beginning at the penstock and extendingdownward: 37 ft. of pipe, 40 in. tapering to 30 in., of No. 10 gaugesteel; 800 ft. of pipe, 30 in. No. 10 gauge steel; 700 ft. of pipe, 30 6 gauge steel; 800 ft. of pipe, 30 in. ^-in. steel; 500 ft. of pipe,30 in. ^i-in. steel. The receiver i^; 60 ft. long, 30 in. in dinniplpr, nnr) fif 7/16. FIG. 4.—DIVERTING DAM. Steel. From it there are taken three 12-in. taps for the respectivethree water wheels. From penstock to nozzle the head is 715 ft.,giving a static pressure of 310 pounds to the square inch. A gate, which weighs 12,000 pounds, and which is pro-vided with a 4-in. bypass gate, is inserted in the pipe line in themanner shown in the accompanying illustration, before the pipe lineenters the receiver. The power house is constructed of a light steel frame, coveredwith corrugated iron. The main building is 30 ft. by 57 ft. in ground
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
