(also known as Hoarding) Haut Koenigsbourg, France ( Le Chateau du Haut Koenigsbourg: notre Demarche) A projecting, roofed timber tower sometimes on the top of a tower or wall. It was used to cover blind spots at the base of the walls. It had holes in the floor through which the defenders could watch and fire on attackers. They later evolved into stone machicolations.
A board of plank lining, or other partition, in any mine passage to confine the air and force it into the working places. Its object is to keep the intake air from finding its way by a short route into the return airway.
A temporary wooden parapet or gallery erected on the battlements of a fortress and used during a siege. They work like machicolations (holes in the floor to drop nasty things on attackers) to cover blind spots on the walls.
A brattice is a partition used in mining. It is built between columns of a sub-surface mine to direct air for ventilation. Depending on the type of mine and how the operation is run, brattices can be permanent (concrete block, tailings, or wood) or temporary (cloth).