Remnants of Jumbo

<
https://upload.wikimedia.org/wikipedia/commons/4/4b/Trinity_Site_-_Remnants_of_Jumbo_-_2010.jpg

General Groves spent $12 million on Jumbo, a steel cylinder 10 feet in
diameter and 25 feet long. Its walls were 14 inches thick and the entire device weighed 200 tons.
<https://www.atomicheritage.org/history/jumbo
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