Na saite Astrometriya Astronomicheskie instrumenty Astronomicheskoe obrazovanie Astrofizika Istoriya astronomii Kosmonavtika, issledovanie kosmosa Lyubitel'skaya astronomiya Planety i Solnechnaya sistema Solnce

Francuzskii fizik. O Kassegrene dostoverno izvestno lish' to, chto on predlozhil opticheskuyu shemu teleskopa, nosyashuyu ego imya. Po odnoi versii on byl professorom fiziki v Kollezh-de-Shartr, po drugoi - skul'ptorom i liteishikom Lyudovika XIV.

25 aprelya 1672 na zasedanii Parizhskoi AN byl dolozhen traktat Kassegrena o megafonah. V traktate takzhe ukazyvalos', chto Kassegren razrabotal shemu teleskopa-reflektora, otlichayushuyusya ot opisannoi I. N'yutonom. V sheme Kassegrena vypukloe vtorichnoe zerkalo raspolozheno tak, chto ono perehvatyvaet luchi ot ob'ektiva do ih shozhdeniya v fokus i otrazhaet v okulyar cherez central'noe otverstie v ob'ektive. Shema Kassegrena imeet ryad preimushestv. V nei chastichno kompensiruetsya sfericheskaya aberraciya, blagodarya chemu ona stala shiroko primenyat'sya pri sozdanii bol'shih teleskopov.

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