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A 1928 Movado Ermeto mechanical chronometer. A mechanical chronometer is a spring-driven escapement timekeeper, like a watch, but its parts are more massively built. Changes in the elasticity of the balance spring caused by variations in temperature are compensated for by devices built into it. [2]
Where "Chronograph" refers to the function of a watch, chronometer is a measure of how well a given mechanical timepiece performs: in order to be labeled a chronometer the timepiece must be certified by the COSC, the official Swiss Chronometer testing institute, [20] after undergoing a series of rigorous tests for robustness, accuracy and ...
John Arnold was the first to design a watch that was both practical and accurate, and also brought the term "chronometer" into use in its modern sense, meaning a precision timekeeper. His technical advances enabled the quantity production of marine chronometers for use on board ships from around 1782.
The hourglass is often used as a symbol representing the passage of time. Clocks; a watch-maker seated at his workbench. Chronometry [a] or horology [b] (lit. ' the study of time ') is the science studying the measurement of time and timekeeping. [3]
COSC ISO 3159 "Chronometer" certified mechanical watch COSC "Chronometer" certified quartz watch. Each officially COSC certified chronometer is identified by a serial number engraved on its movement and a certification number given by the COSC.
A chronograph is a watch with an added duration timer, often a stopwatch complication (as explained above), while a chronometer watch is a timepiece that has met an industry-standard test for performance under pre-defined conditions: a chronometer is a high quality mechanical or a thermo-compensated movement that has been tested and certified ...
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