Rare early warning #WW1 Acoustic Mirror repairs begin. £ from @EH_NorthEast w @SunderlandUK. #Fulwell #HeritageatRisk pic.twitter.com/qWgKlgrsRh
— EH North East Advice (@EH_NorthEast) February 13, 2015
Acoustic early warning systems, spectacular remnants of a dead-end technology on the British coast
Rare early warning #WW1 Acoustic Mirror repairs begin. £ from @EH_NorthEast w @SunderlandUK. #Fulwell #HeritageatRisk pic.twitter.com/qWgKlgrsRh
— EH North East Advice (@EH_NorthEast) February 13, 2015