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 366
h air to the galleries, andthrough g to the box-lobbies through n (for the boxes), so thatneither galleries nor boxes are supplied with vitiated air thathas been respired below. 6. An external discharge, of ample dimensions, protected bya cowl b, or other means, capable of being regulated by a… … 342 VENTILATION OF THEATRES. 7. An independent discharge, connected with the stage aboye,and used to bear with great force on deflagrating mixtures andother materials used from time to time for scenic effect, the va-rious valves m, m, m, commanding any required altitude, andcommunicating with…
