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Science Round Beach Towel featuring the photograph Gregorian Telescope, 17th Century by Science Source

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Gregorian Telescope, 17th Century Round Beach Towel

Science Source

by Science Source

$75.00

This product is currently out of stock.

Image Size

 
 

Product Details

Here it is... the towel that's taking the internet by storm.   Our round beach towels are 60" in diameter and made from ultra-soft plush microfiber with a 100% cotton back.   Perfect for a day at the beach, a picnic, an outdoor music festival, or just general home decor.   This versatile summer essential is a must-have this season!

Design Details

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

Dimensions

60" Diameter Not Including Tassles

Care Instructions

Machine wash cold and tumble dry with low heat.

Ships Within

2 - 3 business days

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Round Beach Towel Tags

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Photograph Tags

photographs telescope photos science photos astronomy photos astronomical photos optics photos optical photos history photos historic photos historical photos famous photos important photos invention photos gregorian telescope photos refracting telescope photos refractor telescope photos

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...

 

$75.00