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 140
dle in the centre, immediately a stream of CURRENTS PRODUCED BY HEAT AND COLD. 115 warm air ascends from it, and colder presses towards it fromevery side. Fig. 75 shews the general progress of the currentsinduced, looking to a section of the apartment. Fig. 76 indi-cates the currents on plan. 233.… … 234. In each of these cases the currents above and below arealways observed in the opposite direction ; with the candle theyare towards the centre on the floor, and from the centre at theceiling; with the ice the movement is the reverse both aboveand below. 235. All local sources of heat and cold…
