Interior of Susquehanna hydroelectric station, c. 1912
Image 44191h, Electricity & Modern Physics Collection
National Museum of American History
Smithsonian Institution
copyright, Smithsonian Institution

The generators mounted in this powerhouse were described as "3-phase, 25 cycle, 11,000 volt generators of 12,000 kw capacity." Notice the overhead crane used for servicing the generators, and the worker on the platform at upper left.