Correcting deviations 
To achieve the highest accuracy a number of corrections were applied to all distances calculated from simple trigonometry:
 Curvature of the earth
 The non spherical nature of the curvature of the earth
 Gravitational influence of mountains on pendulums and plumb lines
 Refraction
 Height above sea level

Superintendents 
1818–1823 – William Lambton
1823–1843 – Sir George Everest
1843–1861 – Andrew Scott Waugh
1861–1884 – James Thomas Walker
1885–1911 – Sidney Gerald Burrard
1912–1921 – Sir Gerald Ponsonby Lenox-Conyngham

See also 
 Principal Triangulation of Great Britain

References

Further reading 
 Matthew Edney. 1997. Mapping an Empire. Chicago: University of Chicago Press. . John Keay. 2000. The Great Arc.
Correcting deviations 
To achieve the highest accuracy a number of corrections were applied to all distances calculated from simple trigonometry:
 Curvature of the earth
 The non spherical nature of the curvature of the earth
 Gravitational influence of mountains on pendulums and plumb lines
 Refraction
 Height above sea level
 Superintendents 
1818–1823 – William Lambton
 1823–1843 – Sir George Everest
 1843–1861 – Andrew Scott Waugh
 1861–1884 – James Thomas Walker
 1885–1911 – Sidney Gene Burrard
 1912–1921 – Sir Gerald Ponsonby Lenox-Conyngham
 See also Principal Triangulation of Great Britain
 References
 Further reading Matthew Edney. 1997. Mapping an Empire. Chicago: University of Chicago Press. . John Keay. 2000. The Great Arc.