Dreadnoughts
With the new century, European rivalries (
and hence naval building), convinced the Government that Britain could not afford the 2-power standard.
The South African (
"Boer") War 1899-1902 had revealed a worrying isolation from the other European powers. In 1902, a 20-year treaty was signed with Japan, allowing the recall of many naval units, and their concentration in home waters and the Mediterranean. In 1904, the Entente Cordiale was signed with France, and another in 1907, with Russia.
"
Dreadnoughts" are the generic name given to battleships designed on the principles of their namesake in 1905-6. The revolution in the British Navy refers to rather more than that. HMS Dreadnought was a product of the Naval Arms Race with Imperial Germany. At 17,900 tons, she was designed to render all other battleships obsolete, and to give Britain a lead in building capital ships which she could not lose.
Battleships were the main index of Great Power status. Battleship quality depended on the combination of armour protection, gunpower and speed.
In 1897, at the Spithead Review to celebrate the Diamond Jubilee of Queen Victoria, the Navy had been made to look foolish by a small, fast demonstration craft called Turbinia (
now in Exhibition Park, Newcastle-upon-Tyne.). Dreadnought had turbines.
To address the problem of gunnery-accuracy, she was an all big-gun ship. Ten 12" guns provided the main armament. Shell splashes would not be complicated by smaller calibre guns, although after Dreadnought, subsequent classes of battleship would re-instate smaller guns (6") to deal with torpedo boats. Admiral John Fisher, the First Sea Lord, also promoted greater proficiency in gunnery, and the centralization of gunnery control on battleships, high above the smoke and guns. [Gun directors and range-finders, plotting the trajectory of shells from several guns to a point where the enemy would be when they fell - speed, wind, direction etc - therefore represent an early form of computer!] In these matters, Fisher became embroiled in a conflict with Lord Charles Beresford, Admiral of the Channel Fleet. Beresford was the sort of Admiral of whom Gilbert & Sullivan might have been proud: impeccably well-connected, personal servants and good dinners on board; spit, polish and tradition. Fisher retired in 1910, tired of the hostility, but Beresford was sidelined, and the Navy's preparedness was the beneficiary in 1914, as the fleet concentrated at Scapa Flow.
HMS Dreadnought
(
the dust jacket of the book published by Conway Maritime Press - an excellent source)
As non-participants in a European Naval Arms Race (
in which the French and Russians had dropped out), the Americans took time out to consider the issues of battleship design from first principles. They discovered the "zone of immunity" ranges between which heavy shells cannot penetrate either side or deck armour. Longer ranges meant that shells plunged from above, increasing the hits on deck. Learning from Tsu-shima that where ships were unarmoured, shells tended to pass through without exploding; light armour by contrast, caused shells to explode and cause almost as much damage from splinters. From this, the Americans developed an "all or nothing" approach: armour at maximum thickness, or not at all. The USS Nevada and Oklahoma (
1911) embodied these principles, and were as revolutionary as the Dreadnought.
After the dreadnoughts came
super-dreadnoughts, with 13.5" or 15" guns, displacing up to 27,500 tons. Two of the latter guns can be seen outside the Imperial War Museum, in London. Fisher was also responsible for the development of the battlecruiser: a concept which evolved from the armoured cruiser of the 1890s: battleships of the time were slow, and could not fire their large guns with great frequency or accuracy. In the 1890s, the latest design of armour allowed ships to be protected with less weight, or to have more widespread protection. Developments in quick firing gunnery meant that smaller guns could fire as far as, and faster than those of battleships. The French Admiral Fournier envisaged a kind of "universal" ship that could fulfil several roles, and outfight a slow battleship with rapid fire, then deliver the coup de grace with one or two bigger (
8"-10") guns.
Fisher proposed to improve rates of fire with A H Pollen's early computerised system of gunnery control, but the Admiralty jibbed at the cost of it. (
Fisher seems not to have considered what would happen when other navies invented their own versions?) What was then left of Fisher's idea was a heavily armed, but lightly armoured vessel which could fight alongside battleships, but be fast enough to catch cruisers and destroy them. An idea looking for a role? Other navies eventually adopted vessels which were heavily armoured, but more lightly armed (
Russians, Germans & USA in WW2), which were really "cruiser-killers". Both types of ship were called "battlecruisers".
Cimbri
