Four inch Everest theodolite, c 1851-1900.

 
Four inch Everest theodolite, c 1851-1900.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Description

The theodolite, a surveying instrument used for measuring horizontal and vertical angles with a rotating telescope, measures an angle sufficiently accurately for the effect of the curvature of the earth's surface to be taken into account. The theodolite's origin is unknown but it has been traced back to 16th century English mathematician Leonard Digges. The theodolite has changed over time. In its current form it is a telescope mounted to swivel both horizontally and vertically. The theodolite is used to find angles in road building, tunnel alignment, and other civil-engineering work. This example was made by Troughton and Simms to the design of George Everest.

Image Details

Image Ref.
 
10408767

© Science Museum / Science & Society Picture Library

buy a print

Select size
 
Select finish
 
How many prints?
 
£20.00
 

buy a framed print

buy a canvas

buy a framed canvas