From the Morgan Sweeney Photograph Collection (PH-00228). Unit A-4 turbine at the Hoover Dam, showing the wicket gates, runner, and shaft in place in 1951.
Illustration of the construction of Boulder Dam, later called Hoover Dam. Caption reads: "Boulder Dam and lower portals of diversion tunnels. Colorado River."
Photograph of Hoover Power Plant's turbine generator unit during the construction of Hoover Dam, 1936. A General Electric sign can be seen in the photo.