COVE

This is an image of the design for da Vinci's "flotation device" or parachute. Near it was the following statement:  "if a man has a tent made of linen of which the apertures [openings] have all been stopped up, and it be twelve braccia [about 23 feet] across and twelve in depth, he will be able to throw himself down from any great height without suffering any injury." It was found in one of his notebooks dated 1483. 

Image Source:
Leonardo Da Vinci's Life. (n.d.). Retrieved May 11, 2019, from http://www.davincilife.com/davincis-parachute.html