Rotor heads for helicopters are large and awkwardly shaped objects, and machining them from a forging is a challenging operation. When Leonardo Helicopters decided to bring manufacture of rotor heads ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Edward Hebern of California designed ...

Edward Hebern of California designed this rotor for a cipher machine. Commercial rotary cipher machines would be introduced in the 1920s and 1930s for commercial purposes by several people in several ...

It was a deceptively simple board — ‘Rotor machining, balancing facility.' But what surprised a team of journalists from India and France was the nearby big, long tunnel at the floor level. It had ...