In 1929, Hiroshima hosted the Showa Industrial Exposition. It ran for 55 days, from March 20 through May 13, at three venues in the city, drawing an estimated 1-3/4 million visitors.
The Western Drill Ground (Venue 1) in the north of the city, was the main exposition grounds, with a main hall showing exhibits related to various national and regional industries. Themed territorial pavilions were also sited there, including pavilions for Hokkaido, Taiwan, Korean, Karafuto Sanko (Sakhalin), and Manmo (Manchuria-Mongolia).
Amusement rides at the exposition included the “Airplane Tower” and the “Circling Wave”, installed at Kodomo no Kuni (lit. “Children’s Land”) laid out to the west of Venue 1. The airplane ride comprised “four model airplanes, each capable of carrying six people, suspended from a 5-jo (25-feet) high steel tower, powered to not only rotate but also ascend and descend.”
The gigantic rotating ride “Circling Wave”, measuring 15 shaku (~5 sq. ft.) in diameter, with a seating capacity of 70, was also popular, according to a contemporary record.