Telescopes and optics Constantijn Huygens Jr.

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tubeless aerial telescope christiaan , constantijn huygens


around 1650 when christiaan huygens became interested in microscopes , telescopes, constantijn helped him construction of lenses. in 1655 christiaan discovered titan, moon orbiting saturn. between 1683 , 1687 constantijn , brother continued make larger , longer focal length telescope objectives culminating in large tubeless aerial telescopes. presented 7.5 inch (190mm) diameter 123 ft (37.5 m) focal length aerial telescope objective royal society in 1690 still bears signature.








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