Mill, Gunpowder-

Is a machine used for mixing or incorporating the ingredients of which gunpowder is composed. The operation was formerly effected as follows: The ingredients being duly proportioned and put into the mortars of the mills, which are hollow pieces of wood, each capable of holding 20 pounds of paste, are incorporated by means of the pestle and spindle. There are 24 mortars in each mill, where are made each day 480 pounds of gunpowder, care being taken to sprinkle the ingredients in the mortars with water from time to time, lest they should take fire. The pestle is a piece of wood 10 feet high, and 4 1 ⁄ 2 inches broad, armed at the bottom with a round piece of metal. It weighs about 60 pounds. For more modern methods of incorporation, see Gunpowder .