🛠️ Invention or technique

Japanese temporal-hour clock (wadokei)

Reloj japonés de horas temporales (wadokei)

Date
c. 1600-1650 · confidence low
Place
Kyoto, Japan
Credited to
Japanese clockmakers
Field
Knowledge & symbols

What it is

Clocks derived from European mechanical ones, adapted to unequal hours that varied with the season, using two foliots or dials with movable numerals. It is an original adaptation of clockmaking to a different time system.

The first clocks arrived with the Jesuits in 1551; double-foliot models date from the 17th century.

What it led to

  • artisanal clockmaking of Edo
  • Tanaka Hisashige's ten-thousand-year clock (1851)
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Sources✓ verified 2026-09-23