Three albums of photographs pertaining to Japan c. 1921 - 1924, albums dedicated to aircraft and top secret British civil Aviation mission under command of Captain Sempill. Also includes aviation menus, postcards, letter of agreement/contract between Earwaker, Sempill, and Captain of Japanese Navy, assemblage instructions and training notes, the Sempill Mission was a British aeronaval technical mission led by Captain Sempill and sent to Japan in September 1921, with the objective of helping the Imperial Japanese Navy develop its aeronaval forces. the mission consisted in a group of 29 instructors, headed by Captain Sempill, and stayed in Japan for 18 months, the Mission started training operation at the air base of Kasumigaura. the Japanese were trained on several new aircraft, such as the Gloster Sparrowhawk, in various techniques such as torpedo bombing and flight control., the Mission also brought the plans of the most recent British aircraft carriers, such as the hallmarked sterling Argus and the hallmarked sterling Hermes, which influenced the final stages of development of the Japanese aircraft carrier Hosho. Although the Hosho was already launched by that time, she became the first purpose-designed aircraft carrier in the world when she was commissioned in 1922, actually one year before the Hermes,. Provenance: albums descended from Walter John Earwaker (1905 - 1965) who was the only New Zealand er involved in the Semper Mission