BL 7.5 inch Mk VI naval gun

The BL 7.5 inch gun Mark VI was the 45 calibre naval gun forming the main battery of Royal Navy Hawkins-class cruisers. These ships with seven single gun mounts were significant to the cruiser limitations defined by the Washington Naval Treaty.

Description
These were built-up guns with two tubes, full-length wire winding, a jacket, and Welin breech block with hand operated Asbury mechanism. They used two cloth bags each containing 14 kg (31 pounds) of cordite to fire a 200-pound (91-kg) projectile up to 19 kilometers at their maximum elevation of 30 degrees. Useful life expectancy was 650 effective full charges (EFC) per barrel.

Coast defence guns
Seven guns were installed as coastal artillery in the Netherlands Antilles, five in Mozambique, three in Canada, and three in a battery at South Shields during the Second World War.