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Appearance of mechanical clock.

It is said that the first mechanical clock in the world was made in the beginning of the 14th century. Along with the development of civilization, the machine advanced, mechanical clocks with weights and escapement machines appeared throughout Europe. Unlike sun dials, water clocks, combustion clocks and hourglasses that utilize the power of nature, mechanical clocks measure the time using a machine. The first mechanical clock was a turret clock installed in the tower, in addition to displaying the time, the bell was ringed to inform the time. In the 15th century turret clocks spread all over Europe. The mechanism of this clock is very simple, but it is a very large machine. This timepiece featuring a crown-type escape machine and a foliot was very bad in pace and had an error of about one hour a day.


世界で最初の機械時計は14世紀初頭に作られたと言われている。文明の発達とともに、機械が進歩し、おもりと脱進機を持った機械時計がヨーロッパ各地に現れた。自然の力を利用した日時計、水時計、燃焼時計、砂時計とは違い、機械を用いて時を計る。最初の機械時計は塔に設置された塔時計で、時刻を表示するほか、鐘を鳴らして時刻を知らせた。15世紀にはヨーロッパ中に塔時計が普及した。この時計の機構は非常に簡単なものであるが、とても巨大な機械である。冠型脱進機・棒テンプを特徴としたこの時計は、歩度が非常に悪く、1日に1時間ほどの誤差があった。

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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。