Towards An Autonomous National Navy
Japan continued in its efforts to build up a strong national naval industry. Following a strategy of "copy, improve, innovate", foreign ships of various designs were usually analysed in depth, their specifications often improved on, and then were purchased in pairs so as to organize comparative testing and improvements. Over the years, the importation of whole classes of ships was progressively substituted by local assembly, and then complete local production, starting with the smallest ships, such as torpedo boats and cruisers in the 1880s, to finish with whole battleships in the early 20th century. The last major purchase was in 1913 when the battlecruiser Kongō was purchased from the Vickers shipyard. By 1918, there was no aspect of shipbuilding technology where Japanese capabilities fell significantly below world standards.
The period immediately after Tsushima also saw the IJN, under the influence of the navalist theoretician Satō Tetsutarō, adopt an explicit policy of building for a potential future conflict against the United States Navy. Satō called for a battlefleet at least 70% as strong as that of the USA. In 1907, the official policy of the Navy became an 'eight-eight fleet' of eight modern battleships and eight battlecruisers. However, financial constraints prevented this ideal ever becoming a reality.
By 1920, the Imperial Japanese Navy was the world's third largest navy and a leader in naval development:
- Following its 1897 invention by Marconi, the Japanese Navy was the first navy to employ wireless telegraphy in combat, at the 1905 Battle of Tsushima.
- In 1905, it began building the battleship Satsuma, at the time the largest warship in the world by displacement, and the first ship to be designed, ordered and laid down as an "all-big-gun" battleship, about one year prior to the launching of HMS Dreadnought. However, due to a lack of material, she was completed with a mixed battery of rifles, launched on 15 November 1906, and completed on 25 March 1910.
- Between 1903 and 1910, Japan began to build battleships domestically. The 1906 battleship Satsuma was built in Japan with about 80% material imported from Great Britain, with the following battleship class in 1909, the Kawachi, being built with only 20% imported parts.
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