A chronometer watch is a watch tested and certified to meet certain precision standards. In Switzerland, only Clocks certified by the COSC may use the word 'Chronometer' on them.... , a watch tested and certified to meet certain precision standards
A Hydrochronometer is a Water clock.In 1867 Fr. Giovan Battista Embriaco created a Hydrochronometer, and sent it to the Paris Universal Expo of 1867, where it received many prizes.... , a water clock
Water clock
A water clock or clepsydra is any timekeeper operated by means of a regulated flow of liquid into or out from a vessel where the amount is then measured....
A marine chronometer is a timekeeper precise enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation.... , a timekeeper used for celestial navigation
Railroad chronometers, or Railroad Standard Watches, are specialized timepieces that once were crucial for safe and correct operation of trains in many countries, including England, the United States, Canada, etc.... , a specialized timepiece once used for safe operation of trains in the United States and Canada
Chronometry is the science of the measurement of time, or timekeeping.It should not to be confused with chronology, the science of locating events in time, which often relies upon it....
A clock is an instrument used for indicating and maintaining the time and passage thereof. The word clock is derived ultimately from the Celtic languages words clagan and clocca meaning "bell"....
