Low Level Bombsight, Mark III

The Low Level Bombsight, Mark III, sometimes known as the Angular Velocity Sight, was a Royal Air Force (RAF) bombsight designed for attacks by aircraft flying below 1,000 feet (300 m) altitude. It combined components of the Mark XIV bomb sight with a new mechanical computer.

Source: Wikipedia — Low Level Bombsight, Mark III (CC BY-SA 4.0)