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Development of modern clocks.

Clock technology has made dramatic progress from the 19th century to the 20th century. The invention of a compound metal called Inver and Elinvar. Riefler standard clock. Free pendulum standard clock. Incabloc. Magnetic escapement. And Quartz. It boasts an great precision and has become a replacement. After that, the National Bureau of Standards of the United States made atomic clocks in 1946. It has absolute accuracy, it became the reference clock.
Electricity was taken into the clock by Bain in 1840. This became a revolution in clock technology, and this clock has become popular and began to violate the area of mechanical clocks.


19世紀から20世紀にかけて、時計技術は飛躍的な進歩を遂げた。インバーやエリンバーの発明。リーフラ標準時計。自由振子式標準時計。インカブロック。磁気脱進機。そして水晶時計。これは精度の卓絶さを誇り、取って代わる存在となった。その後、1946年にアメリカ国立標準局が原子時計を作り、これは絶対精度を持ち、基準時計となった。
また、1840年にべインにより時計に電気が取り入れられた。これは革命となり、流行し、機械式時計の領域を侵し始めた。

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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。