


History of screw propellers - Heliciel. The mills at the time, in this region, were presumably with vertical axis, and probably analogous to those whose ruins remain in Iran: Egyptian Greek Heron of Alexandria(10/70) represents, in a study of the air, a horizontal axis mill that supplies compressed air organ:. ... in 1785, propelled by oars on the aerostat Guyton de Morveau (fig. 4);