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:
HydraulicPowdered Trip Hammers. set of trip hammers on an axle rotated by waterwheel machine used to decorticate grain From the Tiangong Kaiwu encyclopedia of written by the Ming Dynasty encyclopedist Song Yingxing Un ensemble de marteaux tournant autour d'un axe activ par un moulin eau et utilis pour dcortiquer les grains de