With rotating roofs and self - adjusting sails, windmills reached their zenith by the late 19th century, when it was estimated that European mills were churning out some 1,500 megawatts of power.
Vējdzirnavas, kurām bija grozāma galva un uz spārniem — kustīgi nostiprinātie dēlīši, savus ziedu laikus sasniedza 19. gadsimta otrajā pusē.