
BL 16-inch Mk I naval gun
Naval Gun

Naval Gun
The BL 16-inch Mark I was a British naval gun introduced in the 1920s and used on the two Nelson-class battleships. A breech-loading gun, the barrel was 45 calibres long ("/45" in shorthand) meaning 45 times the 16-inch (406 mm) bore – 60 ft (18 m) long.
Read on Wikipedia · Image Coote, R G G (Lt) Royal Navy official photographer, Public domain
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