OPIS
The Washington Treaty of February 1922 put a cap on the construction of capital ships and aircraft carriers while failing to impose similar restraints on auxiliary' vessels or submarines. This led to a competition in treaty cruisers' - ships of the maximum 10,000-ton displacement allowed, armed with multiple 8in guns - and in submarines, many of which were designed for long range and high speed on the surface. During the 1920s the French and the Japanese took particular advantage of the absence of quantitative or qualitative limits for these vessels to compensate for their inferiority in capital ships. Thus, as the ten-year review of Washington approached, Britain and the United States attempted to extend the ratios agreed in 1922 to the newly-defined categories of cruisers, destroyers and submarines. The negotiations which resulted in the Treaty of London of April 1930 were fraught, and the agreement proved controversial, particularly in Japan.