Free Walking Sightseeing Tour #1 in South Cambridgeshire, United Kingdom

The One-Mile Telescope at the Mullard Radio Astronomy Observatory (MRAO), Cambridge, UK is an array of radio telescopes designed to perform aperture synthesis interferometry.

Wikipedia: One-Mile Telescope (EN)

The 4C Array is a cylindrical paraboloid radio telescope at the Mullard Radio Astronomy Observatory, near Cambridge, England. It is similar in design to the Molonglo Observatory Synthesis Telescope. It is 450 m long, 20 m wide, with a second, moveable element. The first large aperture synthesis telescope (1958), it was also the first new instrument to be built at Lord's Bridge, after the Observatory was moved there in 1957, and needed 64 km (40 mi) of reflector wire. The 4C operated at 178 MHz, and located nearly 5000 sources of the 4C catalogue published in 1965 and 1966, which helped establish the evolution of the radio galaxy population of the universe. The telescope is now inoperable.

Wikipedia: 4C Array (EN)

The Interplanetary Scintillation Array is a radio telescope that was built in 1967 at the Mullard Radio Astronomy Observatory, in Cambridge, United Kingdom, and was operated by the Cavendish Astrophysics Group. The instrument originally covered 4 acres. It was enlarged to 9 acres in 1978, and was refurbished in 1989.

Wikipedia: Interplanetary Scintillation Array (EN)

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.

Wikipedia: Cosmic Anisotropy Telescope (EN)

The Half-Mile Telescope was constructed in 1968 at the Mullard Radio Astronomy Observatory with two more aerials being added in 1972, using donated dishes. Two of the dishes are fixed, while two are moveable and share the One-Mile's rail track; to obtain information from the maximum number of different baselines, 30 days of observing were required. Observing frequency 1.4 GHz, bandwidth 4 MHz. Used for Hydrogen Line studies of nearby galaxies and produced the first good radio maps of hydrogen distribution, for M33 and M31. The telescope was operated by the Radio Astronomy Group of the Cambridge University.

Wikipedia: Half-Mile Telescope (EN)