Illustrations of the theory and practice of ventilation : with remarks on warming, exclusive lighting, and the communication of sound (1844)
Reid, D. B. (David Boswell), 1805-1863 · London : Longman, Brown, Green, & Longmans · leaf 446
ir ascends throughit to the open air ; and it is in it that the column of warm air isusually produced, on which the ventilation of the mine depends,a large fire being sustained below for this purpose, at a little dis-tance from the bottom of the shaft. 846. In many pits, instead of two or more… … mine having only one shaft, the air supplying the mine descend-ing by a, and the vitiated air escaping by b. The descendingair at a may be directed solely through the workings of the mine,or part of it may, at times, be sent through the great communi-cating passage on the right, by leaving small…
