Principal Triangulation of Great Britain

The Principal Triangulation of Britain was a triangulation project carried out between 1784 and about 1853 at the instigation of senior surveyor General William Roy (1726–1790).

Principal Triangulation of Great Britain

The Principal Triangulation of Britain was a triangulation project carried out between 1784 and about 1853 at the instigation of senior surveyor General William Roy (1726–1790).