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triggered automatically when the remontoire's weight or spring reaches the end of its power. This frequent rewinding is another source of accuracy, because it averages out any variations in the clock's rate due to changes in the force of the remontoire itself. If the rate of the clock varies as the remontoire spring runs down, this variation will be repeated again and again, each time the remontoire goes through its cycle, so it will have no effect on the long term rate of the clock.
151:. This merely meant that they didn't have to be wound with a key (i.e. they were wound by the then-novel winding crown inside the pendant). Etymologically the term is correct, the mainspring is "rewound" by some other force than a key, but these watches usually do not contain a remontoire as the word is used today.
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around 1595. Usually the "Kalenderuhr" (three month running, springdriven, calendar-desk-clock) Bürgi is considered the oldest surviving clock with a remontoire, even if it does not provide power to the escapement during the few seconds of the daily cycle where the remontoire weight gets wound up by
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is that of the remontoire's spring or weight, so that it is isolated from any variations in the main power source or wheel train, which is just used to rewind the remontoire. Remontoires are designed to rewind frequently, at intervals between fifteen seconds and an hour. The rewinding process is
104:, the large hands, which are attached to the clock's wheel train, are exposed to the weather on the outside of the tower, so winds and accumulations of ice and snow apply disturbing forces to the hands, which are passed on to the wheel train.
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in the geartrain. In spring-driven precision clocks, a gravity remontoire is sometimes used to replace the uneven force delivered by the mainspring running down by the more constant force of gravity acting on a weight. In
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Before the common use of electronic clocks in automobiles, automobile clocks had mechanical movements, powered by an electric remontoire. A low power drive spring would be wound every few minutes by a plunger in a
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runs down. In weight-driven clocks the drive force, provided by a weight suspended by a cord, is more constant, but imperfections in the gear train and variations in lubrication also cause small variations. In
234:, powered by the vehicle's service battery and activated by a switch when the spring tension got too low. Such clocks were, however, notoriously inaccurate, typically being made as cheaply as possible.
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uses a spring. It is the only type which can be used in watches, since the force of a weight would be disturbed by motions of the wearer's wrist
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is visible at the back and the switch points, through which the solenoid winds the spring, are to the right and in their closed position
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95:; its rate is affected by changes in the drive force applied to it. In spring-driven timepieces, the drive force declines as the
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the spring. Today remontoire mechanisms are all designed to deliver power to the escapement during the remontoire reset cycle.
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applies its force to one of the wheels upstream from the escapement, usually to the wheel that drives the escape wheel.
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applies its force directly to the escape wheel of the escapement. Spring remontoires were usually of this type.
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can be either a gravity or spring type. In it, the weight or spring is rewound electrically, with a motor or
60:, it serves to separate the large forces needed to drive the hands from the modest forces needed to drive the
51:, thereby increasing the accuracy by evening out variations in drive force caused by unevenness of the
368:"Mechanical Notes and Drawing Compiled by John Harrison and his son William c.1726-1772", p.13
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189:. It is used in clocks with traditional mechanical movements which are run on electricity.
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386:. Heritage, Jeweler's Circular Keystone, Cahner's Business Information. Archived from
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in 1739. Harrison's working drawing of the device is preserved in the
Library of the
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Internal mechanisms of an electric remontoire clock from a 1960s Rover P4 – the red
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They can also be classified by where in the wheel train the remontoire is located:
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Remontoires are used because the timekeeping mechanism in clocks and watches, the
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333:. Vol. 6. The Encyclopædia Britannica Co., Cambridge. 1910
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is one that uses a weight for power. It is used in precision
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The spring remontoire was invented by
English clockmaker
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With a remontoire, the only force applied to the clock's
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Karsten Gaulke: Der Ptolemãus von Kassel; Kassel: 2007;
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The gravity remontoire was invented by Swiss clockmaker
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swinging. A remontoire should not be confused with a
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clocks that were wound by such electric remontoires.
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Remontoires are distinguished by their power source:
147:after 1860 were stamped on the back with the word
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47:to place the source of power closer to the
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39:. It was used in a few precision
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138:Worshipful Company of Clockmakers
331:Encyclopædia Britannica, 11th Ed
384:Modern Masterpieces of Horology
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16:Part of accurate clock or watch
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378:Fried, Henry B. (July 1995).
132:during development of his H2
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305:) cars were fitted with
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380:"What is a remontoire?"
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143:Many French and Swiss
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199:escapement remontoire
140:in London, England.
281:), as well as some
183:electric remontoire
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165:gravity remontoire
134:marine chronometer
357:978-3-931787-43-1
176:spring remontoire
71:maintaining power
27:(from the French
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392:. Retrieved
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79:How it works
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263:Capri GT/RS
259:Mk2 Cortina
93:isochronous
91:, is never
394:2008-06-23
359:, Page 143
337:2008-06-08
261:, and Mk1
255:Mk1 Escort
149:Remontoire
122:Jost Bürgi
109:escapement
97:mainspring
62:escapement
49:escapement
37:mainspring
25:remontoire
342:p.543-544
313:Footnotes
287:S3 E-type
275:2000/2500
427:Horology
421:Category
327:"Clocks"
271:Dolomite
232:solenoid
223:solenoid
187:solenoid
85:pendulum
66:pendulum
53:friction
29:remonter
21:horology
307:Kienzle
297:), and
291:Daimler
267:Triumph
265:), and
116:History
45:watches
355:
283:Jaguar
277:, and
73:spring
41:clocks
33:spring
295:DS420
239:Rover
237:Many
155:Types
353:ISBN
279:Stag
251:Ford
43:and
23:, a
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245:to
197:An
181:An
87:or
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303:V8
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247:P6
243:P4
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