The Tosa-class battleships were two dreadnoughts ordered as part of the "Eight-Eight" fleet for the Imperial Japanese Navy (IJN) during the early 1920s. The ships were larger versions of the preceding Nagato class, and carried an additional 41-centimeter (16.1 in) twin-gun turret. The design for the class served as a basis for the Amagi-class battlecruisers.
Scale model of Kaga as originally designed
A 41 cm gun on display at the Yamato Museum in Kure, Japan
Tosa, partly complete, being towed from Nagasaki in 1922
Kaga, seen from the stern, under construction in Yokosuka naval yard in November 1928; note the large pipe that directed exhaust smoke down, away from any landing aircraft
The Eight-Eight Fleet Program was a Japanese naval strategy formulated for the development of the Imperial Japanese Navy in the first quarter of the 20th century, which stipulated that the navy should include eight first-class battleships and eight armoured cruisers or battlecruisers.
Mutsu, a Nagato-class dreadnought battleship, at anchor, shortly after completion.
Akagi (A former Japanese battlecruiser converted to an aircraft carrier) being relaunched in April 1925.