London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 188
d 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 centrifugal forceis, therefore, very small, being intercepted by the current fromthe leaf a, whose tangent crosses the exit pipe completely,… … from the impulsion of the vanes, independently of any pressureby centrifugal force ; except as regards its supply of air fromthe centre, which obviously depends upon the unbalanced pres-sure of the atmosphere. That the air cannot enter the exit pipeat less speed than the speed at which the points…
Architecture
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