Form of the Ornithopter.
The ornithopter has hinged planes which work like the wings of a
bird. At first thought this would seem to be the correct principle, and
most of the early experimenters conducted their operations on this line.
It
Ader's Ornithopter Constructed in 1882.
[Description: Black and white illustration: a block on wheels with large
bat-like wings and two windmill-like propellers.]