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David,
It was air-cooled.
During flooding, the water entered the machinery hall, did not affect the small hydro turbines (circa 1918) and ran into the "well" holding the big turbine. The water level was just shy of the rotor centerline. Interestingly, the turbine was horizontal, not (as usually) vertical.
Thus, the bottom stator windings and "south" rotor poles were below water. The manufacturer immediately supplied a drying routine which was strictly followed and proved successful.
Rgds.
Dave
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