As research devices, spark chamber detectors have lower resolution than bubble chamber detectors. It was initially invented for machine analysis of bubble chamber photographs (Hough, 1959). Finally, superheated liquid hydrogen was used in many bubble chamber experiments. He created the first bubble chamber with ether. In effect, each droplet behaves as a miniature bubble chamber. The PICO-60 experimental station is used for a new bubble chamber called PICO-40L. A bubble chamber is simply a container filled with a superheated liquid. PICO-2L was the first bubble chamber to start operation in October 2013. The COUPP collaboration operated a bubble chamber in Fermilab 2011-2012. The 2m bubble chamber was very reliable, accurate and extremely productive. Notable bubble chambers include the Big European Bubble Chamber (BEBC) and Gargamelle. Glaser wanted to further research how bubbles worked, so he built a bubble chamber. The bubble chamber enabled him to observe the paths and lifetimes of the particles.