La Timonerie Chronometer

Details

Description

Marine chronometer by Thomas Mercer 1923 with its acajoufabricant box for admiralty exceptional piece with grand price ivory plate of Neuchatel, mechanical model with rocket and helical chain. It works very well It is called a marine chronometer, a large watch especially designed to keep time on boats. The marine stopwatch has various features:1) It is almost always equipped with a relaxing exhaust and its trotter needle makes a jump every half-second.2) It is equipped with a rocket, Special device, responsible for regulating the force of the engine spring.3) The marine chronometer is mounted on a suspension known as "cardan" like the on-board compasses, arranged in such a way that the so-called chronometer occupies the horizontal position regardless of the movements or position of the boat. It is a very high precision instrument that is used, in particular, for so-called astro navigation with a sextant. Some stopwatches are set to sidereal time. The principle of the determination of longitudes is, very summarized, the following: The boat leaves the port, its stopwatch being set on the time of the Greenwich meridian, it also has special tables (Knowledge of The Times, Nautical Almanac, etc.). These tables indicate, on each day of the year, the time of the passage of the sun and certain stars to the greenwich meridian.To determine the longitude, the officer, responsible for taking stock, observes by means of his stopwatch the time of the passage of any star, or the sun, to his own meridian. The difference between the time of this passage and the time at which the star must pass to the Greenwich meridian indicates, in hours, minutes and seconds, the difference in longitude between Greenwich and the place of observation. Smaller watches, known as edge chronometers, are also used in navigation, a master piece in a collection of marine antiques.

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Features

• Country : FRANCE
• Style : Marine
• Pattern : Yatch club