Fanning mills are used to clean the chaff and weed seeds from grain. Farmers cleaned the grain they would use for seed the following year (removing weed seeds) and they also cleaned grain they would eat. Also called "winnowing machines" or "grain cleaners," they are still used today, mainly in the seed industries e.i. flower and garden seeds etc. My brother Carl Kannianen has a bigger version with basically the same idea. These pictures are from my grandfather Arthur LaBrant'