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Christian Huygens.

Christian Huygens(April 1629-July 1695)

Mathematician, physicist, astronomer in the Netherlands. He actually made the pendulum clock for the first time. He also devised a balance spring, a temp. This contributed greatly to miniaturization and high accuracy of the portable clock.


16th June, 1657 is the era of precision clocks. Christian Huygens attached the pendulum clock to the Netherlands parliament. In this way, the pendulum became used as a governor instead of the foliot, the accuracy was improved, and furthermore, the minute hand was assembled to the clock. Then he devised a balance spring and temp in 1675. This clock is said to be "the first practical mechanical clock in the world."
Besides that, he is also famous for elucidating as being circular the "Saturn's Arm" and "Saturn's Ear" discovered by Galileo Galilei and advocating Huygens' principle.


クリスチャン・ホイヘンス(1629年4月~1695年7月)

オランダの数学者、物理学者、天文学者。振子時計を初めて実際に製作した。また、ヒゲゼンマイ・テンプを考案した。これが、携帯時計の小型化と高精度化に大きく貢献した。


1657年6月16日は精密時計の紀元の日である。クリスチャン・ホイヘンスがオランダ議会に振子時計を取り付けたのである。こうして棒テンプに代わり、振子が調速機として用いられるようになり、精度が向上し、さらには時計に分針が付けられるようになった。その後も、1675年にヒゲゼンマイ・テンプを考案した。この時計が「世界初の実用的な機械時計」と言われている。
またそのほかに、彼はガリレオ・ガリレイの発見した「土星の腕」・「土星の耳」を環状であることを解明し、「ホイヘンスの原理」を提唱したことでも有名である。

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Water resistant.

Even waterproof watches should not be excessively exposed to the threat of water. If you operate the watch crown or button with moisture adhering, water enters inside the watch. If you take a bath while wearing a watch, ingredients such as steam, soap, hot springs will discolor and corrode the metal, and the packing will be deteriorated. If you wash your hands directly from the faucet, watering the watch causes waterproof failure because tap water has high water pressure. The watch is sometimes cloudy due to the temperature difference between the outside air and the inside of the watch. It will not be a problem if it is temporary. 防水時計であっても、過度に水の脅威に晒すことはさけなければならない。 水分が付着したまま、リューズやボタンを操作する。(時計内部に水が入る。)時計を着用したまま入浴する。(蒸気・石鹸・温泉の成分などが金属を変色・腐食させたり、パッキンの劣化を早める。)手を洗う際に直接蛇口から水をかける。(水道水は水圧が高いため、防水不良を引き起こす。) 外気と時計内部の温度差によりくもりが生じることがあるが、一時的なものであれば問題ない。