Coal and the coal mines

by Homer Greene

Gangway. An excavation or passageway, driven in the coal, at a slight grade, forming the base from which the other workings of the mine are begun.

Gas. Fire damp.

Gob. The refuse separated from the coal and left in the mine.

Guides. Narrow vertical strips of timber at each side of the carriage way in shafts, to steady and guide the carriage in its upward or downward movement.

Gunboat. A car used for hoisting coal on steep slopes.

Head-frame. The frame erected at the head of a shaft to support the sheaves and hold the carriage.

Heading. Synonymous with gangway. Any separate continuous passage used as a traveling way or as an airway.

Hopper. A feeding shute or pocket in a breaker.

Horseback. A small ridge in the roof or floor of a coal seam.

Inside slope. An inclined plane in a mine, on which coal is hoisted from a lower to a higher level.