Casegrain reflecting telescope, 1762-1774.
4 0 c m
 
31cm
actual image size: 23cm x 32cm

Casegrain reflecting telescope, 1762-1774.

© Science Museum / Science & Society Picture Library

Description

A reflecting telescope made by the London instrument maker Jese Ramsden (1735-1800) with a 6 inch speculum (metal) mirror. This telescope uses the Casegrain optical configuration. It is mounted on an improved version of James Short's so-called 'universal'; a portable equatorial stand with a bras fork holding the tube and an adjustable polar axis. As it is used on a table or similar surface, the portable telescope has three levelling screws and a pair of sprit levels. Such a lavish instrument would only have been affordable to wealthy amateurs. Ramsden worked for various well-known instrument makers such as Sison, Adams and Dollond, before starting on his own busines in 1762. He went on to become the foremost instrument maker of his day.
 

Image Ref.

10196753
 

buy a print

Select size
 
Select finish
 
How many prints?
 
£20.00
 

buy a framed print

buy a canvas

buy a framed canvas