Chronometer
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Chronometer is a name for certain types of
clock A clock or chronometer is a device that measures and displays time. The clock is one of the oldest Invention, human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, a ...
. It may refer to: *
Chronomètre of Loulié The ''chronomètre'' is a precursor of the metronome. It was invented circa 1694 by Étienne Loulié to record the preferred tempo of pieces of music. The Device Musician Étienne Loulié collaborated with mathematician Joseph Sauveur on the educ ...
, a precursor to the metronome *
Chronometer watch A chronometer (, ''khronómetron'', "time measurer") is an extraordinarily accurate mechanical timepiece, with an original focus on the needs of maritime navigation. In Switzerland, timepieces certified by the Contrôle Officiel Suisse des Chrono ...
, a highly accurate watch *
Marine chronometer A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at t ...
, a timekeeper used for marine navigation, as in **
Longitude by chronometer Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century. It is an astronomical method of calculating the long ...
*
Observatory chronometer An observatory chronometer is a timepiece that has passed stringent testing and a slate of accuracy tests. Thus, the "observatory trial" developed as the standard process for determining accuracy of timepiece movements. If the chronometer passed t ...
, a device certified by an observatory to be extremely accurate *
Railroad chronometer A railroad chronometer or railroad standard watch is a specialized timepiece that once was crucial for safe and correct operation of trains in many countries. A system of timetable and train order, which relied on highly accurate timekeeping, w ...
, a specialized timepiece once used for safe operation of trains


See also

*
Chronometry Chronometry or horology () is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. ''Hor ...
, the science of timekeeping *
Hydrochronometer A hydrochronometer is a kind of water clock. In 1867 Fr. Giovan Battista Embriaco, O.P., inventor and professor of the College of St. Thomas in Rome, created a hydrochronometer and sent it to the Paris Universal Exposition of 1867, where it ...
, a water clock *
Chronograph A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch. A basic chronograph has hour and minute hands on the main dial to tell the time, a small seconds hand to tell that the watch is running, and ...
* Chronoscope {{disambiguation