...a clock used to keep standard time. Historically, it developed from a high-precision regulator clock with a second hand and a pendulum that went back and forth once every two or one seconds, which was used from around the 17th century as a standard for adjusting the daily difference in clock manufacturing and repair. With the spread of wireless communication and radio time signals, and the improvement in the precision of clocks, especially astronomical clocks, standard clocks came to play a role as a prototype, similar to the standards for length and weight, as a source of time signals and standard radio waves. *Some terminology explanations that mention "regulator" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…標準時の保持に使われる時計のこと。歴史的には,17世紀ころから時計の製造,修理において日差を調整する場合の基準として用いられた,秒針をもち,振子は2秒または1秒に1往復する高精度の振子時計(レギュレーターregulator)から発達した。無線通信・ラジオ時報などの普及,時計の精度向上,とくに天文時計の高精度化に伴い,標準時計は時報・標準電波の発生源として,長さ・重さの基準と同様な原器的な意味をもつようになった。… ※「regulator」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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