Leonardo da Vinci Aerial Screw and Lifting Wing
Item
Title
Leonardo da Vinci Aerial Screw and Lifting Wing
Rights
Public Domain
Source
Leonardo da Vinci helicopter and lifting wing.jpg. July 8, 2009. Photograph. Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Leonardo_da_Vinci_helicopter_and_lifting_wing.jpg. Image Credit: Brett Robertson. Public Domain.