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 130
by the very variable currents which the external atmo-sphere presents. 214. Among the mechanical means employed for the move-ment of air, the fan has been used from time immemorial; and, VENTILATION BY FAN. 105 from its simplicity, efficiency, and the facility with which it canbe locally applied,… … 215. The punkah, so common in India, may be considereda gigantic fan. It is placed in the centre of an apartment ingeneral, above a bed, or table, or in any other position that maybe more suitable, being suspended by cords and moved by a lineheld by one or more attendants, either in the apartment…
