Bomb Power Indicator
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Bomb Power Indicator, also known by the acronym BPI, was an instrument built to detect nuclear explosions and measure the peak overpressure of their blast waves. It was used at the twenty five British
The BPI indicator dial seen on the wall of an underground ROC post during a training exercise
Atomic Weapons Detection Recognition and Estimation of Yield known by the acronym AWDREY was a desk-mounted automatic detection instrument, located at 13 of the 25 Royal Observer Corps controls, acros
Bomb Power Indicator
…Zero Indicators it would be possible to estimate the size of the nuclear explosion in megatons. Detailed BPI information was backed up by the automatic AWDREY readings. The BPI was designed and built by the Atomic Weapons Establishment at Aldermaston. The design was tested for performance and accuracy using…
A photograph of an AWDREY display unit taken in situ at the York Cold War Bunker
Awdrey Timing and Logic on display in York