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Paul B  It's hard to stay mad when there's so much beauty in the world ๐Ÿบ // Italy // Nature lover ๐Ÿ // Environmental Scientist // OnePlus One ๐Ÿ“ฒ

Among the papers of the Codex Atlanticus there's a study on the defense of walls from enemy assaults. The fundamental idea is, during an enemy siege, soldiers hidden behind the castle battlements should be able to fend off the assailant and his attack structures with a simple and quick movement of a system of levers.

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