Engineering and Contracting . ags 002 Lamps .011 Piping and fittings 015 Drill repairs 204 Miscellaneous .041 Drill steel 107 Blacksmith coal 027 Freight 063 Feed 031 Total $3,789 Per cu. work.$2,965 . $4,315 Fig. 2. Section of Tunnel, Tallulah FallsDevelopment. Figures 1 and 2 give the location, alignmentand dimensions of the tunnel, the net area ofwhich is 151 sq. ft. within the concrete lin-ing. A circular section would have beensomewhat more favorable to serve the purpose length required timb
Engineering and Contracting . ags 002 Lamps .011 Piping and fittings 015 Drill repairs 204 Miscellaneous .041 Drill steel 107 Blacksmith coal 027 Freight 063 Feed 031 Total $3,789 Per cu. work.$2,965 . $4,315 Fig. 2. Section of Tunnel, Tallulah FallsDevelopment. Figures 1 and 2 give the location, alignmentand dimensions of the tunnel, the net area ofwhich is 151 sq. ft. within the concrete lin-ing. A circular section would have beensomewhat more favorable to serve the purpose length required timbering during constnu-tion. For the purpose of expediting the work, itwas found desirable to drive the tunnel fromthe intake and forebay ends, as well as fromtwo adits 7 ft. high, 13 ft. wide, 105 and217 ft. long, respectively, (adits No. 1 and 2)driven on a 1 per cent grade. Before startingwork at the intake end, 1,01)0 cu. yds. of ma-terial, mostly rock, had to be excavated. Atllic forebay, consisting of a shaft 35 ft. wide,. Fig. 3. Steel Forms for Lining Tunn;l, Tal-lulah Falls Development. the balance with a bottom heading, the over-laying material sloped down on theheading floor. ,\ttention is called here to the May 6, 1914. Engineering and Contracting 533 Fact that, owing to the relatively small of the tunnel, heading excavation repre-liented about 49 per cent of the total excava-lion. POWER PLANT AND EQUIPMENT. The contractor, the Northern Contracting 0., built a temporary power plant housing the dam, to the turbines. .\ o-ft. diametersteel penstock also diverted water from theintake to a 12o-HP. Francis turbine drivinga 50-KW. generator used for lighting pur-poses. The tunnel sub-contractor was furnished,free of charge, with 4,000 cu. ft. of air per
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