Ordnance Survey retriangulation of Great Britain

The bulk of the hill and mountain-top work took place in the 1950s and 1960s.

Ben Nevis, Ordnance Survey retriangulation of GB, October 1960

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Ben Nevis, Ordnance Survey retriangulation of GB, October 1960

"Another wasted day". Ritchie Gallagher, surveyor, on summit of Ben Nevis

1960 1960s Ben Nevis Date certain Geoaccuracy very good Kodachrome NN1671 October Ordnance Survey Outside Scotland Tavistock cairn colour colour photo employees history man map making mountain photo print retriangulation shelter slide snow staff summit surname Gallagher survey surveying surveyor triangulation trig Broadley35