Friday, January 9, 2009

Watch terms-R

reserve de marche: A feature that shows when the mainspring in the watch will need to be wound. This is a complication for mechanical watches that is quite useful and is usually indicated in hours, except in the case of watches that have a very high power reserve numbering in the days.
rehaut: The flange or projection around the inner edge of the watch that typically holds the watch crystal up and reinforces it. The rehaut is typically referred to mostly on Rolex watches as they are inscribed for anti-counterfeiting measures. On most Breitling watches, the rehaut is covered by an applied chapter ring.
rider tabs: The four tabs located on the bezels of many of watches from Breitling such as the Chronomat Evolution and the SuperOcean. They are located on the 3, 6, 9 and 12 o'clock positions.
rotating bezel: A bezel (the ring surrounding the watch face) that can be turned. Different types of rotating bezels perform different timekeeping and mathematical functions.
rotor: The part of an automatic (or self-winding) mechanical watch that winds the movement's mainspring. It is a flat piece of metal, usually shaped like a semicircle, that swivels on a pivot with the motion of the wearer's arm.
retrograde: Used to describe a pointer hand on a watch dial (often a subdial), which returns to zero at the end of a prescribed period. For example a watch may have retrograde date - in this case the hand moves up a scale a day at a time, pointing to the current date - when it reaches 31 it will spring back to 1.
repeater: A device that chimes the time when the wearer pushes a button. Some repeaters, called "quarter repeaters" sound just the hours and the quarter hours ( by means of two different pitched tones); others called "five minute repeaters", sound the hours, quarters, and five minute periods after the quarter; and still others called "minute repeaters", sound the hours, quarters and minutes.
rattrapante chronograph: The addition of a flyback hand (rattrapante) significantly increases the potential uses for chronographs. It makes possible the measurement of split second times or timing simultaneous events of unequal duration.
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