Brass graphometer with magnetic compass, fixed and movable alidade and wooden case, unsigned, European, 1701-1775
Circumferentors (with a full circle scale) and graphometers (with a half circle scale) were widely used in the 17th and 18th centuries for angle measurement. A joint on the support allowed for both vertical and horizontal use. This graphometer has a ball and socket fitting.
Details
- Category:
- Surveying
- Collection:
- Sir Henry Wellcome's Museum Collection
- Object Number:
- 1980-1626
- type:
- graphometer
- credit:
- On loan from the Wellcome Trust
