724 ECONOMICAL ASPECTS 



Hydraulic Equipment. Horizontal turbine water wheels in 

 pairs. Estimate based on figures obtained from two independent 

 manufacturers. Prices include freight charges and cost of installa- 

 tion. Relief valves are estimated separately. 



Electrical Equipment. Prices on electrical equipment are 

 based upon estimates of manufacturers of electrical machinery, and 

 are as follows: 



Generators, all of the 3-phase, 2300-volt, 60-cycle type, per Kw. output: 



For heads of under 40 feet $8 . 00 



For heads of under 40 to 80 feet 7.00 



For heads of 80 to 120 feet. . 6.00 



For heads of 120 feet 5 . 00 



Exciter turbines and exciters, per Kw. output, whole plant 80 



Switchboard and accessories, cables, etc., per Kw. output, whole 



plant 2.25 



Transformers, oil insulated and water cooled, 2,300-60,000 volts, 



per Kw. output, whole plant 4 . 00 



COST OF GEORGIA RAILWAY AND POWER COMPANY'S DEVELOP- 

 MENT AT TALLULAH FALLS, GA. 



(A.I.E.E., October 11, 1915) 



The development consists essentially of an artificial reservoir 

 of a capacity of 1,400,000,000 cubic feet formed by two reinforced 

 concrete buttress dams located near near Mathis, Ga., seven 

 miles from the diverting dam and intake at Tallulah Falls; an 

 artificial reservoir at Tallulah Falls having an available pondage 

 of 63,000,000 cubic feet formed by a cyclopean masonry dam of 

 the gravity type located some 60 feet below the tunnel intake; 

 a tunnel with a cross-sectional area of 151 square feet 6666 feet 

 long leading from the intake at the Tallulah reservoir to the 

 surge or pressure tank at the top of the gorge immediately above 

 the power-house; five steel penstocks 5 feet in diameter, each of 

 which serves a 17,000-H.P. Francis type water turbine in the 

 power-house. Five three-phase, 60-cycle 6600-volt, vertical 

 generators are direct-connected to these water wheels. 



The electrical energy from these machines is stepped up from 

 6600 volts to 110,000 volts for transmission by five banks of three 

 3333 Kw. single-phase static transformers of the water-cooled 

 type and is transmitted over two outgoing lines. 



Reservoir. The reservoir covers 834 acres, most of which was 



