Engineering and Contracting . 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
Engineering and Contracting . 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. Piston drills were used first, but owing tothe hardness of the rock and its abrasiveproperties, necessitating much sharpening,thus being a serious hindrance to progress,Leyner water core air drills Xo. T. wereadopted, and their use immediately caused ageneral improvement in progress. With pis-ton drills, starting holes was found a chiefdifficulty to overcome, and drilling of dryholes gave little satisfaction. No. 2 Leyner bit sharpeners were installed TABLE IV. CostItems— Labor » Cement Miscellaneous materials 2J11 Lumber «1|» Freight 0-0|« Transportation Xici Insurance •; •» Rovaltv on concretmg machme w«« Miscellaneous expenses J-JOS Crushing rock *• J» Quarrjing rock «?» Plastering concrete •: Cleaning up tunnel Total* $12,041 •Blaw concreting forms and depreciation onequipment not Included. 4. Charging Platform and Generate Mixing and Conveying Machines for TunnelLining, Tallulah Falls Development. wo 500-HP. S. Morgan Smith hydrau
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