Vacuum tank for Fermilab's 15 foot bubble chamber. The chamber was installed in the Bubble Chamber Building at Fermilab in November 1971 and after retirement moved to this public viewing area in June 2004. Source archive copy at the Wayback Machine.

Source (dead link): http://tdserver1.fnal.gov/mdl/photos/15Ft%20Bubble%20Chamber/15ft%20BubbleChamber.jpg^{[dead link]}

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