Norden Bombsight

The Norden bombsight was a tachometric bombsight used by the United States Army Air Forces (USAAF) and the United States Navy during World War II, and the United States Air Force in the Korean and the Vietnam Wars to aid the crew of bomber aircraft in dropping bombs accurately. It was known as the "Blue Ox". Key to the operation of the Norden were two features; a mechanical computer that calculated the bomb's trajectory based on current flight conditions, and a linkage to the bomber's autopilot that let it react quickly and accurately to changes in the wind or other effects. Together, they allowed for unprecedented accuracy in day bombing from high altitudes; in testing the Norden demonstrated a circular error probable (CEP) of 75 feet (23 m), an astonishing performance for the era.

Read more about Norden BombsightBackground, Adaptations

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Lotfernrohr 7 - Operation
... Operation was fairly similar to the Norden ... bombardier would first locate the target in the bombsight and continue to adjust the dials until it remained motionless in the eyepiece ... This allowed the bombsight to calculate the wind speed from the cancelled out drift rate, which in turn allowed to make an accurate calculation of groundspeed ...
Convicted Members of Duquesne Spy Ring - Herman W. Lang
... Norden Corp ... which manufactured the Top Secret Norden bombsight and other highly confidential materials essential to the national defense of the United States ... The Norden had been considered a critical wartime instrument by the United States Army Air Forces and American bombardiers were required to take an oath during their training stating that they would defend its secret ...
Norden Bombsight - Adaptations
... The Norden operated by mechanically turning the viewpoint so the target remained stationary in the display ... The Norden could not rotate the sight fast enough for bombing at low altitude, for instance ... Typically this was solved by removing the Norden completely and replacing it with simpler sighting systems ...
Norden Bombsight - Description and Operation - Basic Operation
... To improve the calculation time, the Norden used a mechanical computer inside the bombsight to calculate the range angle of the bombs ... This not only reduced the time needed for the bombsight setup, but also dramatically reduced the chance for errors ... This attack on the accuracy problem was by no means unique, several other bombsights of the era used similar calculators ...