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:
DalgarvenMillCupRing. My own photograph taken to illustrate this section of the article own br Transferred from org en transferred to Commons by User Liftarn using de php CommonsHelper Rosser at org en en Rosser Original upload log page en DalgarvenMillCup Ring Rosser bytes no own photograph taken to illustrate