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 136
h they are worked. For example, though the screw propelsthe air onwards, as indicated by the arrows, the movement isstrongest at the circumference; and, at the centre, on the sidewhere the air escapes from it, an eddy or current in the oppositedirection may be traced. THE PUMP AND BELLOWS. 228.… … preference is given generally to the fanner and the screw, therotatory motion by which they are worked, and the continuity of 112 GENERAL CONCLUSIONS. the stream which they produce, affording great advantages forordinary purposes. 229. On the whole, then, it may be concluded,— 1. That, for a large…
