Another image.
"Two German inventors have made what they call an aeromobile which is an auto driven by an air propeller. The air screw is not installed vertically, however, but lies horizontally on the back part of the chassis. Above it are several parallel plane surfaces forming a sort of lattice-work arrangment, the angles of which can be altered. The air stream produced by the propeller breaks through these surfaces, providing the driving power. When the surfaces are perpendicular the car stops, when they lean back, it moves forward, and when they are pushed forward, the car moves backward."
