Bracchia Quotes (1 quote)
If a man has a tent made of linen of which the apertures have all been stopped up, and be it twelve bracchia across (over twenty-five feet) and twelve in depth, he will be able to throw himself down from any height without sustaining injury. [His concept of the parachute.]
In Isaac Asimov and Jason A. Shulman, Isaac Asimovs Book of Science and Nature Quotations (1988), 3-4, which notes twelve bracchia is over 25 feet. There are other translations with different units. Da Vincis illustration in his notebook showed a pyramid-shaped parachute below which hung a man suspended by a few short cords.