Surrey Industrial History Group (SIHG)

SIHG Zoom Meeting. Industrial Archaeology in Plain Sight

Thursday, 6 October, 2022 - 10:00

Talk to be given by Simon Ritchie.  The Ordance Survey has been mapping the UK for over 200 years. Until recently they used simple mathematics, theodolities and a network of benchmarks and trig points to achieve one metre accuracy, a triumph of engineering in its day. This network is now redundant and beginning to need conservation, but nobody is picking up that responsibility.