branch tunnels it becomes possible to huge vertical penstock, 101% feet in diameter, which close down one-half of the station for repairs while opens into two annular passageways that lead entirely the other half is running. Thus to all intents and around the axis of the turbine. They deliver the… … ing tunnel was driven parallel with the the car is obtained when passing a Falls to the point of exit of the big tun- given spot at a given time, recording Section Through the Niagara Falls. the actual time to the fraction of a sec- nel. After the working tunnel had been carried to within a short…
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