Shepherd patent 24-hour electric clock at Greenwich Observatory, Ordnance Survey benchmark and British public standard lengths

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Size: 3083px × 4800px
Location: Greenwich Observatory, London, UK
Photo credit: © Julian Money-Kyrle / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 24, benchmark, benchmarks, british, clock, greenwich, hour, length, lengths, observatory, ordnance, patent, public, royal, shepherd, standard, survey