Public Domain Mark 1.0
Drawing of a flying machine
Leonardo da Vinci · ca. 1485
Bibliothèque de l'Institut de France, Paris; digital reproduction via Wikimedia Commons
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Artwork credits
The Engineer's Codex uses a small number of historical studies as evidence of a continuing tradition: observe closely, understand the system, and make.
CC0 1.0 Public Domain Dedication
Diagram of a proposed flying machine
Leonardo da Vinci; print published by Carlo Giuseppe Gerli · 1789
Toronto Public Library Special Collections; digital reproduction via Wikimedia Commons
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