The Bubble Chamber is now obsolete, and sits as a piece of modern art and a testament to past works at Fermilab. It resembles a deep-sea bathescape, and it's close in design - the heart is a 15" vacuum sphere. From Fermilab: "In simple terms, a bubble chamber is a device used for the detection and the study of elementary particles and nuclear reactions. Charged particles from an accelerator are introduced into a super-heated liquid, each forming a trail of bubbles along its path. The trails are photographed, and by studying such pictures scientists can identify the particles and analyze the nuclear "events" in which they originate." In other words, it's a lens.
This was cutting edge tech in the 1960's!