Myriad year clock

Ten-Thousand Year Self-ringing Bell), was a universal clock designed by the Japanese inventor Hisashige Tanaka in 1851.

This clock is designated as an Important Cultural Property and a Mechanical Engineering Heritage by the Japanese government.

Because the length of the day and night changes according to the season, the time dial was automatically movable, and it was linked with the other six clocks, making it an extremely complicated mechanism.

However, even then it was not possible to make exact copies of some parts, such as the brass metal plate used as its spring, before the presentation at Expo 2005.

[2] The original clock is displayed at the National Museum of Nature and Science, while a copy is at Toshiba Corporation.

Tanaka Hisashige's Myriad year clock, in the National Museum of Nature and Science , Tokyo .
The clock displays Japanese, equal hour, and calendar information.