50.7 MB (2.9 MB compressed)
4965 x 3570 pixels
42.2 x 30.2 cm ⏐ 16.6 x 11.9 in (300dpi)
ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
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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