Altazimuth theodolite, 1775-1785.

 
Altazimuth theodolite, 1775-1785.
4 0 c m
 
29cm
actual image size: 21cm x 32cm

Description

The manufacture of this instrument is attributed to both Henry Hindley of York and John Smith. A theodolite is an altazimuth surveying instrument designed for taking angles in two coordinates. It is provided with both a vertical and a horizontal arc or circle and a telescopic sight, so that altitudes and azimuths can be taken from a single sighting.

Image Details

Image Ref.
 
10308167

© Science Museum / Science & Society Picture Library

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