Coal and the coal mines

by Homer Greene

Jacket. One of the sections or frames of wire mesh of which a revolving screen is made up.

[Keeps.] Projections of wood or iron on which the carriage rests while it is in place at the head of the shaft.

Lagging. Small timbers or planks driven in behind the legs and over the collars to give additional support to the sides and roof of the passage.

Legs. The inclined sticks on which the collar rests in gangway, tunnel, drift, and slope timbering.

Lift. All the workings driven from one level in a steep-pitching seam.

Loading place. The lowest extremity of the breaker, where prepared coal is loaded into railway cars.

Lump coal. The largest size of prepared anthracite.

Manway. A passageway in or into the mine, used as a footway for workmen.

Mouth. The opening, at the surface, of any way into the mines.