BRATTICE. In mining, a partition in an airway, constructed to regulate ventilation. A brattice is built of varying materials, according to the nature of the mine; it may be of stone or brick or strong boards. The term is in familiar use both in Britain and the United States, and its origin is found in the German word brett, a board. A brattice must be airtight, and when it is con structed of a timber framing it is covered with a "brattice cloth" made of tarred canvas. Sometimes a brattice is made with a sliding door to allow of varying regulation of the air current. See MINING.