How did newton learn about the way a windmill operated?

When Isacc Newton went away to school in Grantham he was very excited as he watched a windmill being
constructed?. Isacc being?Isacc? constructed his own model windmill? and caught a field mouse and called him?Mr Miller.
Later on Isacc complained Mr miller?at all corn he grinding .
Isaac drew a picture of the windmill on his wall.