London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 187
the chiefpart of the power applied to drive it, in carrying the air roundwith its vanes, instead of throwing it off at the discharge-pipe.The English Company of Machine-makers settled at Rouen, towhom it belongs, have been obliged to alter it after the plan nowcommonly adopted in Lancashire. The… … in it, that in the concentric fan only two leaves out of five areeffective, and that very little more than one half of the exit pipeis occupied with the regular current of air produced by therotation of the leaves. The quantity thrown out by vircdfe ofthe pressure under which the air is kept by the…
Architecture
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