The triangulation points that mapped Britain


In 1936, the Ordnance Survey began to construct concrete triangulation pillars, or trig points, to aid accurate measurement and map-making using the principles of trigonometry. By 1962, more than 6,000 had been built. And Stephen McCoy and Stephanie Wynne are trying to photograph the 310 primary pillars still standing.

image captionBlack Combe, Cumbria, 600m (2,000ft)
image captionCadair Berwyn, Powys, 827m
image captionCold Ashby, Northamptonshire, 210m

The pillars were built in positions where at least two other points could be seen in order to form triangles for accurate measurement.

McCoy and Wynne's work comprises large 360-degree panoramic photographs produced by placing the camera on top of the triangulation pillar, alongside a picture of the pillar itself.

image captionCriffel, Dumfries and Galloway, 569m
image captionGarnedd Ugain, Gwynedd, 1065m
image captionGreat Whernside, North Yorkshire, 704m
image captionMartinsell Hill, Wiltshire, 289m
image captionRottington, Cumbria, 141m
image captionSnaefell, Isle of Man, 621m
image captionThe Stiperstones, Shropshire, 536m
image captionUpton Beacon, Derbyshire, 538m
image captionWinter Hill, Lancashire, 456m
image captionWyck Beacon, Gloucestershire, 250m
image captionYr Eifl, Gwynedd, 564m

All photographs copyright Stephen McCoy and Stephanie Wynne.

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