Principal Triangulation of Great Britain
![Three-foot theodolite used in the triangulation](/Images/godic/202502/17/3foottheodoliteramsden0910.jpg")
![General Roy's baseline: map as about 1935](/Images/godic/202502/17/General_Roys_Baseline0910.jpg")
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).
Trigonometrical Survey
英语百科
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