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First design for an ornithopter showing the flappersFirst design for an ornithopter, showing the flappers in the down-position and the counterpoises (above) in the up-position. 1808. From Cayleys original notebook
Diagrams of a herons wing: (a) plan view; (b) wing section; (c) rear view, to show lateral curvature. 1808. From Cayleys original notebook
Sketches of a heron (rear view) with wings extended. 1808. From Cayleys original notebook
Small experimental gunpowder engine, showing the bow string mechanism to effect the return stroke of the piston. 1807. From Cayleys original notebook
Model glider; a kite mounted on a pole (with a weight beneath), and a cruciform tail unit attached by a universal joint. 1804. From Cayleys original notebook
Whirling arm for testing aerofoils, rotated by a weight and cord over a pulley. 1804. From Cayleys original notebook
Sir George Cayleys drawingsSir George Cayley manuscript illustration. From: C.H. Gibbs-Smith Sir George Cayleys Aeronautics 1796-1855 (London: HMSO/Science Museum)
Cayley exercise book inside front coverCayley exercise book, inside front cover
Cayleys HelicopterCAYLEYs HELICOPTER-AEROPLANE With two lateral helicopter rotors to provide lift, and two propellers for propulsion, this is an astonishingly far- sighted proposal