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 Royal Observer Corps (ROC) controls and nearly 1,500 ROC underground monitoring posts, across the United Kingdom during the Cold War.[1]
- ^ Lee-Frampton, Nick (1985). "Protect and survive". New Zealand International Review. 10 (2): 25–27. ISSN 0110-0262.