London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 189
s friend Captain Ericsson tobe of the best construction. The drawing is so plain as to su-persede the necessity of a detailed description. VYith regard to the quantity of air thrown out by a fan of thisconstruction, it may be ascertained approximately by multiplyingthe speed of the points a, c, e,… … Suppose the extremities of the leaves to move at the rate of 80 ft.per second, the sectional area of the exit pipe to be square feet;then 2X80 = 160 cubic feet; which number, multiplied by 60seconds, gives a product of 9600 cubic feet of air discharged per This, reduced into weight, will be ^ = 738…
Architecture
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