Simple theodolite

Simple theodolite (simple theodolite) Simple theodolite with fixed sights, moveable alidade

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Science Museum Group Collection
© The Board of Trustees of the Science Museum, London

Simple theodolite with fixed sights, moveable alidade
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Simple theodolite, maker unknown, made in Italy, 1600-1630.

Simple theodolites were used for measuring angles during land surveys. This theodolite has fixed sights and a movable alidade. Its umbra versa (vertical) and umbra recta (horizontal) scales enable altitudes (vertical angles) and azimuths (horizontal angles) to be measured. It would have been used with a tripod for stability and accuracy.

Details

Category:
Surveying
Object Number:
1918-123
Materials:
brass
type:
simple theodolite
credit:
Court, Thomas Henry