History: Plate Steel Spiral Casing for 70,000 horse-power Niagara Falls hydraulic turbine unit at the Allis-Chalmers Manufacturing Company, Milwaukee, Wisconsin, ca. 1920 [445x624]

https://i.redd.it/3jc31dxbdng11.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/981v5x/plate_steel_spiral_casing_for_70000_horsepower/?utm_source=ifttt