Reflections on heaviness and studies of the balance.

Studies of the equilibrium of bodies on the balance.

Notes and drawings of mechanics.

Studies of bird-flight.

Model of wing with only one brace.

Studies of the air-compression produced by wing-beats.

Studies of the mechanics of bird-flight.

Mechanism of the articulation of wings.

Plan for the villa of the governor of Milan, Charles d’Amboise.

Barriers to water-flow. Below: drawings of gearing-mechanisms.

018v

Studies of the centre of gravity of the flying bird. In the centre: a drawing of a leaf in red chalk.

15v

Sketches of articulated mechanical wings with double or single brace.

011v

Studies of the way in which the bird directs itself in flight depending on the wind.

c.8r

Detail of the articulation of an artificial wing.

c. 6v

Studies on the centre of gravity of a flying bird.

c. 5r