Science Art: Heart of the Turbine, by Lewis W. Hine, 1930.

Scientific illustration of a worker manufacturing (or repairing) a gigantic Westinghouse engine (or generator).
Direct capture
Scientific illustration of a worker manufacturing (or repairing) a gigantic Westinghouse engine (or generator).

A gelatin silver print of a man making a Westinghouse engine. I think this might be an AC generator, but I’m not sure – the notes for Hine’s photo in the Smithsonian galleries didn’t mention the machine, only the year the photo was made.

Found in the Smithsonian Open Access collection.