Brake-sieve.
(Mining.) A rectangular sieve operated by a forked lever or brake, from which it is suspended in a cistern of water for the agitation of comminuted ore. The meshes are of strong iron wire, 3/8 of an inch square. The brake is supported by a rolling axis. See jigger. The poorest light pieces are cuttings. Pieces of poor, sparry, heavy ore are chats.