Break-through. A cross-heading or entrance, used in the bituminous mines.
[Breast.] The principal excavation in the mine from which coal is taken; known also as chamber.
Broken coal. One of the regular sizes of prepared anthracite.
Buckwheat coal. One of the regular sizes of prepared anthracite.
Buggy. A small car or wagon used for transporting coal from the working face to the gangway.
Buntons. The timbers placed crosswise of a shaft down its entire depth, dividing it into vertical compartments.
Butt. In bituminous coal seams, the vertical planes of cleavage at right angles to the face cleavage.
Butty. A comrade; a fellow-worker in the same chamber.
Cage. See [Carriage.]
[Carriage.] The apparatus on which coal is hoisted in a shaft.