Codex on the Flight of Birds of a kite as seeking a wind current. When the winds are high, one will see the bird very high in the sky, but when the winds are low, the bird stays closer to the ground. Leonardo describes how a bird rests in the air, after flapping its wings to gain altitude, by gliding downward to the ground. Folio 6 contains multiple diagrams of birds flying and their bone structure, and all of the commentary is on flight and how birds fly the way that they do. Leonardo starts off by describing how a bird ascends or descends in different
Singing bird box In some movements the flapping of the bird's wings and its ability to turn its head are also cam-controlled, in others not. The final cam determines the point at which the song ends, the bird folds away, the lid drops and the motor stops. The bird's beak movements are always connected to the cam controlling the air supply to the whistle: in this way the sound and beak movements are automatically synchronized. The whistle consists of a miniature organ pipe containing a close-fitting piston which can be moved up and down to give a range of notes of over an