accuracy of aerial bombing Drift Sight Harry Wimperis Royal Naval Air Service wind speed Course Setting Bomb Sight World War II Mark XIV bomb sight RAF Bomber Command Norden United States Army Air Forces World War I
Mechanical devices were also used to aid the accuracy of aerial bombing. Drift Sight was the first such aid, developed by Harry Wimperis in 1916 for the Royal Naval Air Service; it measured the wind speed from the air, and used that measurement to calculate the wind's effects on the trajectory of the bombs. The system was later improved with the Course Setting Bomb Sight, and reached a climax with World War II bomb sights, Mark XIV bomb sight (RAF Bomber Command) and the Norden (United States Army Air Forces).
