Great Melbourne Telescope, artwork

Great Melbourne Telescope, artwork

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: Great Melbourne Telescope. This reflector telescope was constructed by optician Thomas Grubb in 1868 in Dublin for the Melbourne Observatory, Australia. It had a mirror 122 centimetres in diameter with a focal length of 9.3 metres. Its equatorial mount moved it to compensate for the rotation of the Earth, easily allowing it to follow an object across the sky. The skeleton tube framework (6.4 metres in length) had spiral strips and rings for increased strength and freedom from tremor. The pulleys at the observer's end moved a mirror at the other end, to focus the image. It was used to observe the skies of the Southern Hemisphere. In the 1940s it was broken up to provide parts for other telescopes.

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