page_title: Half-Mile Telescope
hierarchical_section_title: Half-Mile Telescope
caption_attribution_description: English: Radio Interferometer: These two dishes were part of the Half-Mile Telescope, a radio interferometer utilising the line of an old railway SW of Barton on the Mullard Radio Observatory site of the Cambridge Cavendish Laboratory. In the distance are two more identical dishes, and two large dishes that are part of the One-Mile Telescope. Also visible on the right is the line of elements comprising the 4C Array.
context_page_description: 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.
context_section_description: The Half-Mile Telescope was constructed in 1968 (2 aerials) at the Mullard Radio Astronomy Observatory with two more aerials being added in 1972, using donated dishes (total cost was £70,000). 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 (21 cm wavelength), bandwidth 4 MHz. Used for Hydrogen Line studies of nearby galaxies and produced the first good radio maps of hydrogen distribution (as a function of its velocity), for M33 and M31 (also produced nearly 20 PhDs and 50 published papers). The telescope was operated by the Radio Astronomy Group of the Cambridge University.
caption: The Half-Mile Telescope in May 1977: 2 fixed dishes in the foreground and 2 moveable ones in the distance (just in front of the 2 larger and darker dishes of the One-Mile Telescope)
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