General Knowledge - General Science - Discussion

What is the difference between chronometer and ordinary clocks, what is the variation of mechanisms?

What do you mean by wrist watch?

Rolex.

It's a famous wrist watch.

What is Rolex?

Nice description. Thank you all.

Radio clocks, radio controlled watches, and atomic clocks have made mechanical clock-chronometers obsolete for time standards used scientifically and/or industrially. Most custom watchmakers do still produce them, however, and they are considered status symbols when produced by the likes of Rolex.

A timepiece or timing device with a special mechanism for ensuring and adjusting its accuracy, for use in determining longitude at sea or for any purpose where very exact measurement of time is required.

A marine chronometer is a clock that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation. When first developed in the eighteenth century it was a major technical achievement, as accurate knowledge of the time over a long sea voyage is necessary for navigation, lacking electronic or communications aids.