This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Peirce Mill Millstones in place. en look at the millstones ready to grind grain in Peirce Mill Rock Creek Park Washington DC Note the long beam at the top connected to the vertical wooden beam used to open the sluice outside and also on the left the wooden pedestals with cranks to adjust the height of the millstones The Peirce Barn