Illustration of Herschel's 40-foot telescope

Bildnummer 11879765
Illustration of Herschel's 40-foot telescope
Herschel's 40-foot telescope. Illustration depicting the large reflecting telescope built by Sir William Herschel in 1787-9 at a cost of #4000. The tube of the telescope was forty feet (12 metres) long. Unlike other reflector telescopes,the eyepiece was situated at the open end of the tube. This removed the need for a secondary mirror and its associated loss of light. The position of the eyepiece did,however,mean that the astronomer had to climb some distance to make an observation; one visitor,the Italian astronomer Piazzi,fell from the structure and broke his arm. The telescope was finally dismantled in 1839
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library
Bildgröße: 3985 px × 4753 px
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Eigentums-Rechte: nicht erforderlich
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