The Ground Zero Indicator, known by the acronym GZI was a specially designed shadowgraph instrument used by the British Royal Observer Corps during the Cold War to locate the Ground Zero of any nuclear explosion. It consisted of four horizontally mounted cardinal compass point pinhole cameras within a metal drum.
The Ground Zero Indicator, known by the acronym GZI was a specially designed shadowgraph instrument used by the British Royal Observer Corps during the Cold War to locate the Ground Zero of any nuclear explosion. It consisted of four horizontally mounted cardinal compass point pinhole cameras within a metal drum.
Source: Wikipedia "Ground Zero Indicator" · CC BY-SA 4.0
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