The Cosmic Anisotropy Telescope (CAT) was a three-element interferometer for cosmic microwave background radiation (CMB/R) observations at 13 to 17 GHz, based at the Mullard Radio Astronomy Observatory. In 1995, it was the first instrument to measure small-scale structure in the cosmic microwave background. When the more sensitive Very Small Array came online, the CAT telescope was decommissioned in a ceremonial bonfire. External links Cosmic Anisotropy Telescope (CAT) online The first detection of small-scale structure in the cosmic microwave background Press release from 1995 describing first measurements of small-scale structure in the cosmic microwave background The CAT enclosure on Google Maps Cavendish Laboratory Radio telescopes Interferometric telescopes Cosmic microwave background experiments