Cyril Field, The British Navy Book
“ Cruisers proper in our navy are now officially classed in three main divisions—"battle-cruisers", "cruisers", and "light cruisers", though a very short time ago they were subdivided into "armoured cruisers", "first-class protected cruisers", "second-class protected cruisers", "third-class protected cruisers", "unarmoured cruisers", "lightly-armoured cruisers", and "scouts".The battle-cruiser is a hybrid and, as this war has proved, a most useful war-vessel. She is not so heavily armed or armoured as a battleship of equivalent age, but has much greater speed. ”
