Photo of Split Rock Lighthouse State Park, Minnesota, United States
Photo of Split Rock Lighthouse State Park, Minnesota, United States
The gear assembly of the light house. The lens floats on a pool of mercury. A weight drops down the tower, turning this gear assembly and thus turning the light. Every two hours operators had to climb the tower and crank the weight back up to keep the rotation in operation.

This photo was taken on October 1st, 2011. This photo has been viewed 357 times.
   Split Rock Lighthouse State Park Photos
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