Circumferentor, 1750-1763.
Image number: 10280187
This circumferentor was made by George Adams of London, one of the top instrument makers of the day. It was used between 1750-1763 on the survey of the Mason-Dixon line, in America. The instrument is inscribed in an engraved circle; 'Geo: Adams LONDON'. Circumferentors (with a full circle scale) and graphometers (with a half circle scale) were widely used for angle measurement in the 17th and 18th centuries. A joint on the support allowed for both vertical and horizontal use.
- Image number:
- 10280187
- Credit:
- Science Museum/Science & Society Picture Library
- Date taken:
- 29 October 2003 13:13
- Image rights:
- Science Museum
