FLOUR MILL • FREE TRANSLATOR.ORG • Definition of Flour mill

... tubs the peat is pulverized under addition of water; the fine parts pass the sieves, while the latter retain the coarse fibres, roots, etc. The peat-mud flows from the tubs into mills, made like a flour mill, but the "stones" constructed of hard wood. The "stones" have a diameter of 8 feet 6 inches; the lower is 8 inches; the upper 21 inches thick. The pressure of the upper "stone" is regulated by adjusting the level ...

— Peat and its Uses as Fertilizer and Fuel • Samuel William Johnson