a partition (often temporary) of planks or cloth that is used to control ventilation in a mine
<noun.artifact> [ verb ]
supply with a brattice, to ventilate mines
<verb.possession>
Brattice \Brat"tice\, n. [See {Brettice}.] (Mining) (a) A wall of separation in a shaft or gallery used for ventilation. (b) Planking to support a roof or wall.