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Ordnance Survey celebrates 80 years of the trig pillars that helped map Great Britain. ... This is Worcester Beacon trig pillar at sunset, photographed by Dan Grant.
Trig pillars were first used in the retriangulation of Great Britain on April 18, 1936. Up until this point, map-making had been based on a collection of observations between 1783 and 1853. Read More ...
Ordnance Survey celebrates 80 years of the trig pillars that helped map Great Britain. ... This is Worcester Beacon trig pillar at sunset, photographed by Dan Grant.
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