Visitors to the Discovery Centre will notice that the Lovell Telescope is currently undergoing some maintenance work. A number of significant tasks are being undertaken: painting, steelwork repairs at the top of one of the supporting towers, and replacement of the original 1957 surface.
The impressive 76-metre diameter Radio Telescope, named after Sir Bernard Lovell, was a pioneering development in the science of radio astronomy when it was first built over 60 years ago. At the time of its completion in 1957, it was the world’s largest radio telescope and its still the third largest of its kind in the world today. It continues to operate as a cutting-edge research instrument but is also Grade I listed by Historic England as a building of exceptional scientific, cultural and historic interest.
In order to remain in good operational order, the telescope must be continuously maintained. Large jobs, like those being undertaken at the moment, are conducted during the summer, when days are longer and the weather is usually better.
In the first major upgrade to the telescope in 1970-71, a new reflecting surface with a shallower curve was added above the original, together with a large new wheel girder system to help support the weight of the bowl. In the early 2000’s, this additional surface was itself replaced with a new galvanised steel surface with a more accurate paraboloidal shape significantly improving the efficiency of the telescope (pictured below).
Throughout these upgrades, the original 1957 surface was left in place as an integral part of the structure providing significant protection from wind and rain to the reverse of the reflecting bowl. It is this surface which is visible from below when the telescope is parked pointing towards the zenith, as it is at the moment.
Despite continual care, the condition of this surface has now deteriorated to the extent that it needs replacement. The work required is significant and is planned to take place over two consecutive summers. It is being conducted by Taziker Industrial who have extensive experience of refurbishment of large steelwork structures, including the Iron Bridge in Shropshire, the Tay Rail Bridge and the Royal Albert Bridge over the River Tamar.
Sections of the original surface will be carefully kept for use in our Heritage Lottery Fund project, First Light, celebrating the history of the Observatory. At the heart of First Light will be a new exhibition featuring these carefully preserved sections of the surface.
Continual maintenance and major tasks like those currently underway are a key part of ensuring the telescope will continue to make fundamental contributions to radio astronomy research over the coming decades.