New Orleans-class cruiser
The New Orleans-class cruisers were a class of seven heavy cruisers built for the United States Navy (USN) in the 1930s.
USS New Orleans
1943 ONI identification image for the New Orleans class
A heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in calibre, whose design parameters were dictated by the Washington Naval Treaty of 1922 and the London Naval Treaty of 1930. Heavy cruisers were generally larger, more heavily-armed and more heavily-armoured than light cruisers while being smaller, faster, and more lightly-armed and armoured than battlecruisers and battleships. Heavy cruisers were assigned a variety of roles ranging from commerce raiding to serving as 'cruiser-killers,' i.e. hunting and destroying similarly-sized ships
HMS Frobisher, a Hawkins-class cruiser around which the Washington Naval Treaty limits for heavy cruisers were written.
Armoured cruiser USS Tennessee, armed with four 10-inch (250 mm) guns, ca. 1907
HMS Hawkins, lead ship of her class.
HMAS Canberra, a County-class "treaty cruiser".