For Gregorian telescope - the first field training binoculars.

Gregorian telescope is a reflector and an interesting project is the first concrete project of a telescope mirror. He is currently only a limited number of cases.

Credit for the first reflector to Italian professor named Niccolò Zucchi. He makes him a first application in 1616, but not very practical purpose of the project. James Gregory is a Scottish mathematician and astronomer of the 17th century and is designed to work with the first practical reflector telescope. In 1663 he published a book called Optics promoters. But he created the first working version of up to ten years later, with the help of scientist Rosenthal hook. He is a period of ten years since Sir Isaac Newton is famous Newton telescope (1670). Therefore, before Newton, but Newton Gregorian telescope designed to create first.

As Gregorian telescope.

Understand how the first taste Gregorian Newtonian reflector telescope. In Newtonian parabolic mirror at the end of the tube and focus the light from the glass tube at a fixed rate, unless the tube. The eyes of the pipe. The Gregorian design is at the bottom of the tube plates and focus light from the second tube, but is light and direct Ellipsoid glass tubes through holes in the large central primary mirror. Type of telescope is the end.

Advantages and disadvantages.

Newton telescope is a parabolic mirror and glass, while Gregory is the primary and secondary mirror images are ellipsoid. Furthermore, Gregory glass base holes in the middle. This means that much more difficult and complex eye instruments do. Newton is designed to do. This is the reason that Gregory is the ten years before working version.

Gregorian useful comparison with the Newtonian style. Ellipsoid second mirror at some point after the call for fire. This configuration contributes to the eye, right or top right of the image, while Newton telescopes to image the head. This is a great benefit when using the telescope into standby mode. Because of this failure are two tubes of glass Aperture. The windshield, a light and heat to prevent unwanted main achievements of the glass. This tool is useful when the camera is designed to warm and the sun and noticed that the amount of interest. For this reason, the Gregorian design is still sometimes used in solar telescopes view.

Gregorian telescope design is not very common in modern. A significant increase and change Cassegrain telescope. But sometimes I use Gregorian chant of applications a hunter will be limited by the wide scope. Due to the nature of the ad is correct. And the iris may sometimes also used to create a telescope for solar observation.

Gregory telescope, but this does not spread on a clearance and for most of the current design scope.

by Willard Kalif