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Gregorian telescope
noun
- a telescope similar in design to the Cassegrainian telescope but less widely used.
Gregorian telescope
noun
- a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror
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Word History and Origins
Origin of Gregorian telescope1
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Word History and Origins
Origin of Gregorian telescope1
C18: named after J. Gregory (died 1675), Scottish mathematician who invented it
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Example Sentences
But in the Gregorian telescope, the image formed by the principal mirror falls on a second mirror, which is very small, slightly curved, and parallel to the first.
From Project Gutenberg
Some recent discoveries in astronomy having arrested his mind, and awakened in him a powerful spirit of curiosity, he sought and obtained from a friend the loan of a two-foot Gregorian telescope.
From Project Gutenberg
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