ClipArt ETC
An illustration of Penaud's artificial flying bird. "a b c d, a', b' c' d', lactic wings which twist and untwist when made to vibrate; a b, a' b', Anterior margins of wings; c d, c' d', Posterior margins of wings; c, c' Inner portions of wings attached to central of model by elastic bands at e' f, India-rubber in a state of torsion, which provides the motive power, by causing the crank situated between the vertical wing supports (g) to rotate; as the crank revolves the wing are made to vibrate by means of two rods which extend between the crank and the roots of the wings; h, tail of artificial bird." -Britannica, 1910

Penaud's Artificial Flying Bird

An illustration of Penaud's artificial flying bird. "a b c d, a', b' c' d', lactic wings which twist…