More: https://www.wisconsinhistory.org/Records/Image/IM2045Plate Steel Spiral Casing for 70,000 horse-power Niagara Falls hydraulic turbine unit at the Allis-Chalmers Manufacturing Company erecting shop. The casting inlet diameter is 15 feet while the overall diameter is 50 feet. The plate thickness varies from 7/8 to 1 1/4 inches. Note the automobile in the lower right corner for scale.

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