Vversion of the Chinese top.

Credit - Gary Bradshaw; "To Fly Is Everything"

1845 design for a helicopter by Cossus

Credit - Gary Bradshaw; "To Fly Is Everything"

Mr. Bright designed and patented this apparatus.

Credit - Gary Bradshaw; "To Fly Is Everything"

Advancing the idea suggested by Launoy.

Credit - Hiller Aviation Museum

Aerial screw machine worked by steam

Credit - Gary Bradshaw; "To Fly Is Everything"

Penaud's flying screw

Credit - Wright State University

Apparatus powered by a gunpowder motor

Credit - Gary Bradshaw; "To Fly Is Everything"

The invention of Dieuaide

Credit - Gary Bradshaw; "To Fly Is Everything"

This design by Melikoff in 1877.

Credit - Gary Bradshaw; "To Fly Is Everything"

This design of Castel in 1878.

Credit - Gary Bradshaw; "To Fly Is Everything"

Forlanini's steam-powered apparatus.

Credit - Gary Bradshaw; "To Fly Is Everything"

Trouve's arial screw and electric motor.

Credit - Gary Bradshaw; "To Fly Is Everything"

Leonardo sketch

Credit - Hiller Aviation Museum

Cayley drew up plans for aerial carriage

Credit - Hiller Aviation Museum

Cayley's design in "On Aerial Navigation."

Credit - Gary Bradshaw; "To Fly Is Everything"