Mining. (UNDER-1 5 c.)
1883. Gresley, Gloss. Coal-m., 266. Undercast, an air course or wind road carried underneath a wagon way or other road.
1886. J. Barrowman, Sc. Mining Terms, 69. Undercast, the lower of two air courses at an air crossing.
Mining. (UNDER-1 5 c.)
1883. Gresley, Gloss. Coal-m., 266. Undercast, an air course or wind road carried underneath a wagon way or other road.
1886. J. Barrowman, Sc. Mining Terms, 69. Undercast, the lower of two air courses at an air crossing.
