Tuning fork clock - Onsadokei (English spelling) Tuning fork clock

Japanese: 音叉時計 - おんさどけい（英語表記）tuning fork clock
Tuning fork clock - Onsadokei (English spelling) Tuning fork clock
A clock that uses the frequency stability of a tuning fork. A tuning fork is used as a mechanical resonant circuit for a low-frequency oscillator, and the output of the oscillator drives a synchronous motor clock. The frequency of the tuning fork is 50 Hz, 60 Hz, or an integer multiple thereof. There are also tuning fork watches that have a small mercury battery and a transistor circuit built in.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
音叉の周波数安定性を利用した時計。音叉を低周波発振器の機械的共振回路として利用し，その出力で同期電動機時計を駆動する。音叉の周波数としては，50Hz，60Hz，あるいはその整数倍を用いる。小型水銀電池とトランジスタ回路を内蔵する音叉腕時計もある。

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