These ships with seven single gun mounts were significant to the cruiser limitations defined by the Washington Naval Treaty.

[4] These were built-up guns with two tubes, full-length wire winding, a jacket, and Welin breech block with hand-operated Asbury mechanism.

The total weight of the mount including its 1in open-backed shield was 45.975 tons.

They used two cloth bags each containing 14 kg (31 pounds) of cordite to fire a 200-pound (91-kg) projectile up to 19 kilometres at their maximum elevation of 30 degrees.

[2] 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.