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The homes in the study were constructed in such a way as to minimize the thermal effects of Annie, with an eye towards determining if, in the absence of fire, the basement of the closer home — 3,500 feet (1,100 m) from the hypocenter — might shelter its occupants, while the second — at 7,500 feet (2,300 m) — could remain standing. [4]
Operation Upshot–Knothole was a series of eleven nuclear test shots conducted in 1953 at the Nevada Test Site. It followed Operation Ivy and preceded Operation Castle . Over 21,000 soldiers took part in the ground exercise Desert Rock V in conjunction with the Upshot-Knothole Grable shot. [ 1 ]
The M65 atomic cannon, often called Atomic Annie, [6]: 92 was an artillery piece built by the United States and capable of firing a nuclear device. It was developed in the early 1950s, at the beginning of the Cold War ; and fielded between April 1955 and December 1962, in West Germany , South Korea and on Okinawa .
Original file (Ogg multiplexed audio/video file, Theora/Vorbis, length 13 s, 1,920 × 1,080 pixels, 6.61 Mbps overall, file size: 10.13 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Upshot–Knothole Grable was a nuclear weapons test conducted by the United States as part of Operation Upshot–Knothole. Detonation of the nuclear weapon , a W9 warhead , occurred 19 seconds after its deployment at 8:30am PDT (1530 UTC ) on May 25, 1953, in Area 5 of the Nevada Test Site .
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The operation consisted of 29 explosions, of which only two did not produce any nuclear yield.Twenty-one laboratories and government agencies were involved. While most Operation Plumbbob tests contributed to the development of warheads for intercontinental and intermediate range missiles, they also tested air defense and anti-submarine warheads with smaller yields.