Flying machine driven by the operator's feet
An ornithopter whose wings twist, turn and drop by levers, balanced from the point N
The upper drawing is a large winged flying machine, labelled with the operator's position and the point M-N-m where 'the heart comes'. A detail below explains the wing mechanism: element a twists the wing, b turns it with the lever and lowers it, and d raises the lever. The pilot keeps his feet at f g and works them alternately so that as one presses down the other lifts the wings, whose balance M N is hung from the top N so the wings fall partly down and partly back toward the man's feet.
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Great flying machine, labelled M-N-m
The main figure is a winged flying machine carrying labels M, N, m, with the note that at m 'the heart comes', plus reeds (tubes) and the lettered points g, d, c, b, a, f. It sets out the overall frame of the wing apparatus.
Wing-working levers driven by the feet
In the detail, a twists the wing, b turns it with the lever and lowers it, and d raises the lever. The pilot's feet rest at f g and work in opposition, and the wings' balance M N hangs from the top N so that on the down-stroke the wings move partly downward and partly backward toward the feet.