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Science Tote Bag featuring the photograph Gregorian Telescope, 17th Century by Science Source

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Gregorian Telescope, 17th Century Tote Bag

Science Source

by Science Source

$33.00

Size

Image Size

 
 

Product Details

Purchase a tote bag featuring the photograph "Gregorian Telescope, 17th Century" by Science Source.   Our tote bags are made from soft, durable, poly-poplin fabric and include a 1" black strap for easy carrying on your shoulder.   All seams are double-stitched for added durability.   Each tote bag is machine-washable in cold water and is printed on both sides using the same image.

Design Details

The Gregorian telescope is reflecting telescope designed by Scottish mathematician and astronomer James Gregory in the 17th century, and first built... more

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2 - 3 business days

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Tote Bag Tags

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Photograph Tags

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Comments (1)

John Read

John Read

This is not a Gregorian telescope, it looks more like an F-10 newtonian. A Gregorian telescope, as the caption suggests, has a focal point (near where you look) at the back of the telescope, through a hole in the primary mirror (located at the back of the telescope).

Artist's Description

The Gregorian telescope is reflecting telescope designed by Scottish mathematician and astronomer James Gregory in the 17th century, and first built in 1673 by Robert Hooke. The design pre-dates the first practical reflecting telescope, the Newtonian telescope, built by Isaac Newton in 1668, but was not successfully built until 5 years after Newton's first reflecting telescope. The Gregorian telescope consists of two concave mirrors; the primary mirror collects the light and brings it to a focus before the secondary mirror where it is reflected back through a hole in the center of the primary, and thence out the bottom end of the instrument where it can be viewed with the aid of the eyepiece. This design solved the problem of viewing the image in a reflector by allowing the observer to stand behind the primary mirror. It renders an upright image, making it useful for terrestrial observations. It also works as a telephoto in that the tube is much shorter than the system's actual focal l...

 

$33.00