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Leonardo da Vinci (Vinci 1452-Amboise 1519)

The bones and muscles of a bird's wing c.1512-13

Pen and ink over black chalk | 22.2 x 20.4 cm (sheet of paper) | RCIN 912656

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Four studies of the bones of a bird's wing, with notes on its construction; a small drawing of a bird flying, with notes on its action; lines bearing proportionate relationships to each other, and fractions expressing those relationships