Hooke's telescopes, 17th century

Hooke's telescopes, 17th century

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: Hooke's telescopes. 17th-century engraving with labelled diagrams showing telescope equipment and mechanisms described by English scientist Robert Hooke (1635-1703). The diagrams include eight variant optical arrangements devised by Hooke for shortening telescopes (across top) and a micrometer instrument (across bottom). The telescope arrangements show light rays being reflected by various mirrors inside the telescope tub before reaching the observer's eye. At bottom left is a universal joint. This is plate 1 from Hooke's 'A Description of Helioscopes' (1676).

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