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This bench mark was used during the First primary levelling, England & Wales, and was levelled with a height of 126.9150 feet [38.6837 metres] above mean sea level (Liverpool datum). It was included on the Liverpool to Port Carlisle levelling line. The surveyor's description was No. 271. Bolt in South face and towing-path side of Sedgwick Viaduct ; 4.15 ft. above surface (p417).