The Ordnance Survey (OS) trig pillar looks down
from the summit of Chinley Churn onto Chinley village, and the distant
Chapel-en-le-Frith.
The OS erected 6500 of these pillars between 1936
and 1962, as triangulation points, to improve the accuracy of their maps.
The OS map makers no longer use the trig pillars,
but employ the more accurate satellite technology. Look at the OS Blog for more information
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