Gregorian telescope
The Gregorian telescope is a type of reflecting telescope designed by Scottish mathematician and astronomer, James Gregory in the 17th century.
Gregorian Telescope
This entry contributed by Dana Romero
A type of telescope developed by Scottish astronomer-mathematician (1638-1675). Gregory described his design in his 1663 publication Optica Promota (The Advance of Optics).
Gregorian telescope
Table klepsydra, Italian, about 1670. Ref ID: E0120 © National Maritime Museum, Greenwich, London The principle of the Gregorian telescope was first described by James Gregory in the 1660s.
Gregorian Telescope
(a) Telescope devised - but never constructed - by James Gregory, in which an auxiliary concave mirror reflects the magnified image, the right way up, through a hole in the centre of the main objective mirror, i.e.
The Gregorian telescope, invented by James Gregory, employs a concave, not convex, secondary mirror and in this way achieves an upright image, useful for terrestrial observations.
His first important contribution to scientific knowledge was the comparison of the merits of the Cassegrainian and Gregorian telescopes, ...
Gregorian telescope, a form of reflecting telescope. See under Gregorian. -- ...
in which an auxiliary convex mirror reflects the magnified image, upside down, through a hole in the center of the main objective mirror - i.e., through the end of the telescope itself. It was, however, no improvement on the gregorian telescope ...
 See also: Telescope, Light, Astronomy, Second, Focus
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