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Norris Dam and powerhouse. Norris generator hall. Turbines are enclosed in and below round concrete housings, generators are contained in steel upper portion. In peacetime visitors are admitted to balcony shown at left to inspect control room and are then taken to generator floor. Roof trusses are considered unattractive; later projects are framed with rigid steel arches

Norris Dam and powerhouse. Norris generator hall. Turbines are enclosed in and below round concrete housings, generators are contained in steel upper portion. In peacetime visitors are admitted to balcony shown at left to inspect control room and are then taken to generator floor. Roof trusses are considered unattractive; later projects are framed with rigid steel arches

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