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In page HMS Agincourt (1913):

"

Approximately 70 long tons (71 t) of high-tensile steel was added to the main deck after the Battle of Jutland to protect the magazines. Two 3-inch (76 mm) anti-aircraft guns were added to the quarterdeck in 1917–18. A 9-foot (2.7 m) rangefinder was added to the former searchlight platform on the foremast at the same time. A high-angle rangefinder was added to the spotting top in 1918.[1]