geways that lead entirely the other half is running. Thus to all intents and excavated at a rate as high as 68 feet per week. The around the axis of the turbine. They deliver the wa- diameter of the excavation was 30 feet. The tunnel is purposes the Electrical Development Company has two ter to the… … near the edge of the Palls, and a work- the apparatus is that a photograph of Showing the outlet of the tailrace tunnel for discharging the water behind the falls. ing tunnel was driven parallel with the the car is obtained when passing a Palls to the point of exit of the big tun- given spot at a…
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