Wheatley Windmill Milling Day. Spur wheel and the stone nut on the ground floor transfer power from the main shaft to the millstones on the floor above.
An aeolian (wind-powered) musical machine. As seen at the Garden of Memory Summer Solstice show at Oakland’s Chapel of the Chimes, 2016. More Sonic Windmill: https://youtu.be/5ikRkJacyxg