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Published online by Cambridge University Press: 24 August 2017
The law, to which I wish to call attention first in this article, can hardly be called unknown, but it has certainly remained unnoticed by the great majority of designers of aeroplanes and other flying machines, and has been generally ignored by scientific writers in aerodynamics, although some of the latter have recognised its existence without apparently seeing its importance ; or, perhaps, although cognizant of its existence, they have been unable to reconcile it with “Langley's law,” and have therefore refrained from giving it the emphasis it undoubtedly deserves.
* By "efficiency " is here meant the weight lif ted and sustained per power unit.
* Page 64 of his AerQd ynamics, reproduced here in Fig. 1, curve B.
† Page 62 of Aerod ynamics.
‡ G. Eiffel, La Resistance de l' Air. Paris 1910, pp. 229 and 233.
* See La Res. del' Air p. 233.
* For instance, all eff orts at producing, mechanically, a vacuum above a plane are especially '.' time-wasting," for they must depend on removing a small quantity of air at a high velocity, which is an extremely inefficient process, in the light of law (A).