Definition of Gregorian telescope
1. Noun. A reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror.
Gregorian Telescope Pictures
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Lexicographical Neighbors of Gregorian Telescope
Literary usage of Gregorian telescope
Below you will find example usage of this term as found in modern and/or classical literature:
1. Ferguson's Lectures on Select Subjects in Mechanics, Hydrostatics by James Ferguson (1814)
"... On the Gregorian telescope. To the observations already made upon this instrument, we have only to add a few practical remarks. ..."
2. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"Gregorian telescope. g mitron baring a common axis and their concavities facing «ch other. The focus of A for parallel rays is at F, ..."
3. The Monthly Review by Ralph Griffiths (1814)
"... ought not to be admitted without extreme caution; and it was suspected that the polish of the great mirror of the Gregorian telescope might not be quite ..."
4. The Monthly Review by Ralph Griffiths (1814)
"In the Gregorian telescope, a column of light from a point of the object is received on the large mirror, and reflected in a cone of rays, the vertex of ..."
5. Descriptive Astronomy by George Frederick Chambers (1867)
"The Gregorian telescope consists of a large concave metal speculum, in the centre of which a circular aperture is pierced. A 2nd concave speculum, ..."