 Flour dressers appear in water-powered mills in the United Kingdom dating to the 17th century and their use continued into the 20th Century in the UK and other countries as the grain milling industry converted from water power to steam and other forms of power to drive mill machinery.Grain to be processed into flour is first ground, typically in one or more steps, then the bran is separated from the flour produced by grinding the grain.The flour produced from the grain is further separated by size through sifting (or bolting).