ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Herschel's 40-foot telescope, circular glass plate photograph. The telescope's wooden scaffolding is seen here on 9 September 1839, at Observatory House in Slough, England. It was photographed by the astronomer John Herschel (1792-1871) before its demolition. The telescope was designed by John's father, the German-born British astronomer William Herschel (1738-1822). The tube was 40 feet (12 metres) long. The first observations with this telescope were carried out 50 years earlier on 28 August 1789, when two new moons of Saturn (Enceladus and Mimas) were discovered. John Herschel and W H Fox Talbot had invented the process we now know as photography. This is one of the earliest surviving glass plate photographs.
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