Chanute, Octave, 1832-1910 · New York, The Railroad and engineering journal · leaf 30
Fig. 6. self-contained motor, and perhaps, after all, the best ex-ample of this class of contrivance is the artificial butterflyof M. Dandrieux, which is shown in fig. 7. … Fig. 7- The flight of all these toys lasts but-a few seconds, andnone of them carries its own motive power, while it willbe found by measuring accurately the foot-pounds ex- 26 pended, and the weights sustained in a given time, thatnot one of the prime movers known is as yet sufficientlylight, in…
Aeronautics
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