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Topic: Certified Chronometers

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	Chronometer - Wikipedia, the free encyclopedia
		John Harrison, a yorkshire carpenter, developed a clock based on a pair of counter-oscillating weighted beams connected by springs, whose motion was not influenced by gravity or the motion of a ship.
		His chronometers H1–H3 were all of this design but were large and heavy, were required to be suspended from a beam in a ship, and suffered from small inaccuracies due to precession that did not become apparent until long-distance sea trials occurred.
		This method remained in use until microchips reduced the cost of a quartz clock to the point that electronic chronometers became commonplace.
	en.wikipedia.org /wiki/Chronometer (888 words)

	MSN Encarta - Clocks and Watches
		The battery may drive the balance wheel of an otherwise mechanical clock, or it may be used to drive the oscillations of either a small tuning fork or a quartz crystal.
		Carefully constructed mechanical timepieces known as chronometers are precision devices used by navigators in the determination of their longitude at sea and by astronomers and jewelers for calibrating measuring devices.
		The modern wrist chronometer is a precision watch regulated in different positions and at various temperatures and certified by testing bureaus in Switzerland.
	encarta.msn.com /encyclopedia_761577936/Clocks_and_Watches.html (639 words)

	Chronometers
		Chronometers are not to be confused with chronographs.
		The chronometer would be set to GMT so would therefore need to be highly accurate an respond under various changes in temperature and atmospheric conditions.
		If a chronometer was inaccurate, the resultant loss in time could prove disastrous to the sailors, since just a few minutes of time loss could mean a ship is hundreds of miles off course.
	www.chronomaster.co.uk /chronometers.htm (317 words)

	Railroad chronometers - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-14)
		Railroad chronometers (railroader's watches) were critical to the safe and correct operation of trains in the United States.
		A system, which relied on accurate timekeeping, called Timetable and Train Order was used to ensured that two trains could not be on the same stretch of track at the same time.
		W.C. Ball's guidlines are the basis of the officially certified Chronometers standards, as now laid out by the "Société Suisse de Chronométrie", which was founded in 1924 and "The Swiss Official Chronometer Testing Institute" COSC ("Contrôle Officiel Suisse des Chronomètres").
	encyclopedia.worldsearch.com /railroad_chronometers.htm (279 words)

	chronometer \| TutorGig.co.uk Encyclopedia (Site not responding. Last check: 2007-10-14)
		He finally solved the accuracy problems with his H4 chronometer, essentially a large 5 inch (12 cm) diameter watch, winning a prize from the British Admiralty.
		Nevertheless, in Switzerland nowadays, over 1,000,000 Officially Certified Chronometers certificates, mostly for mechanical wrist-chronometers (wrist- watch) with sprung balance oscillator, are being delivered each year, upon having been submitted to the COSC's most severe tests, each singly identified by an officially recorded individual serial number.
		Chronometer Makers of the World: With List of International Makers and..
	www.tutorgig.co.uk /ed/chronometer (910 words)

	Octantis - Certified Marine Quartz Chronometers
		Recognized as the most accurate of all timekeepers, the marine chronometer has always taken pride of place in the history of watchmaking.
		Faithful to this tradition and equipped with an ETA movement, this officially certified marine chronometer guarantees an exceptional degree of precision.
		Fulfilling the extreme precision requirements of mariners, this certified marine chronometer, produced in a limited and numbered series, is one of the most accurate quartz watches in the world.
	www.piquotmeridien.ch /octantis_e.html (272 words)

	Chronometer Details, Meaning Chronometer Article and Explanation Guide
		This is the paragraph where, due to time constraints, Thomas Ernshaw and the development of the practical spring detent escapement chronometer are mentioned only briefly.
		This is followed by a paragraph about the Hamilton Watch Co.'s World War II era miracle of mass production and standardization of the chronometer.
		While there is no internet in the early 20th century yet, please send mail to the address and date provided by this article in October 2004 for further information.
	www.e-paranoids.com /c/ch/chronometer.html (736 words)

	Clocks and chronometers FAQ
		John Harrison (1693-1776), an English clockmaker and carpenter, is credited with the invention of the chronometer in 1761, although his first (of five) prototype chronometers was actually completed in 1735 (H.1 1735, H.2 1739, H.3 1741, H.4 1761, H.5 1772).
		The result of years of experimentation and a government sponsored competition aiming to improve the accuracy of their ships' navigation, he persevered with entirely new designs, each time attempting to minimise size and weight while increasing accuracy, until the fourth version (in 1761) finally was up to the required standards for the British navy.
		Continued improvements in chronometers and the establishment of the prime meridian in 1884, from which all measurements of longitude are made, made determining longitude more accurate.
	www.answerbag.com /c_view.php/2406 (1269 words)

	Chronocentric: Accuracy of Fine Wristwatches
		Only watch movements certified with a COSC 'bulletin de marche' (certificate of watch performance) are allowed to bear the internationally protected label "Official Swiss Chronometer" or even use the word "Chronometer" anywhere on the product, packaging or advertising.
		Movements that were not certified may still exceed the COSC standards--the manufacturer may simply have simply chosen to bypass the expense of the certification process.
		Likewise, "Certified Chronometer" also means nothing different than just "Chronometer." It is a redundant phrase--since Chronometer status is a certification--that is used like "verde green" or "hot water heater" to ensure that the reader clearly and quickly understands the point.
	www.chronocentric.com /watches/accuracy.shtml (1387 words)

	Same mov't, different # of jewels? (Site not responding. Last check: 2007-10-14)
		Under somewhat antiquated definitions, a chronometer is a carefully regulated clock that was used for navigation.
		Nowadays, a chronometer is any watch that has passed the tests of a certifiying agency (COSC- don't know of the top of my head what the initials stand for- is the common one, maybe the only one).
		A chronograph may be a chronometer, if so certified,and a chronometer may or may not be a chronograph depending on what it is equipped with.
	www.urban-living.org /new-1419279-692.html (2037 words)

	Articles - Watch (Site not responding. Last check: 2007-10-14)
		The latitude could be measured by looking at the stars, but the only way a ship could measure its longitude was by comparing timezones; by comparing the midday time of the local longitude to a European meridian (usually Paris or Greenwich), a sailor could know how far he was from home.
		However, the process was notoriously unreliable until the introduction of John Harrison's chronometer.
		A chronograph is a type of complication, as explained under the heading "Complicated Watch." A chronometer is a watch or clock whose movement has been tested and certified to operate within a certain standard of accuracy.
	www.sinoz.com /articles/Watch (1535 words)

	How does a chronometer work? : Clocks and chronometers
		"Chronometer" is simply a more or less obsolete name for a clock, traditionally a very accurate ship's clock or a railroad clock.
		The term does live on in Switzerland, where the most accurate mechanical watches may be certified as "Officially Certified Chronometers" by the government.
		There are a great many different mechanisms used in mechanical clocks, but today's wristwatches all use a variation of the balance wheel escapement.
	www.answerbag.com /q_view.php/13399 (313 words)

	Ordering your COSC Certificate From Omega
		Omega is currently the #2 producer of COSC certified chronometers in the entire world (207,668 produced in 2003 according to the FH News Page).
		So clearly a COSC certified chronometer is a special watch, and ads to the value of owning a watch by Omega.
		They may be the #2 COSC chronometer producer, but their customer service is 2nd to none.
	www.rolexreferencepage.com /omegacosc/omegacosc.html (1240 words)

	Bambooweb: Chronometer
		John Arnold and others tackled this, with the development of the practical spring detent escapement chronometer.
		Aaron Lufkin Dennison was the pioneer in the industrial revolution of watch making as early as 1850 in developing the
		American System of Watch Manufacturing by Interchangeable Parts at the Waltham Watch Company, which is at the base of today's worldwide manufacturing methods.
	www.bambooweb.com /articles/c/h/Chronometer.html (686 words)

	cosc
		Some are "certified chronometers," which is not to be confused with mere chronographs.
		Watch movement that do not exceed the mean (average) deviation by two seconds gained or lost over a 24-hour period and measured at different temperatures and in various positions are awarded the Chronometer Certificate.
		Watches that have passed the COSC testing sometimes include the numbered certifiate or a replica of it with the watch papers, and many brands (such as Rolex) make certification statements on the watch face ("Superlative Chronometer Officially Certified").
	swisswatchpassion.homestead.com /cosc.html (335 words)

	Islands 2
		An outbreak of peace found him out of RN service until in July 1786 he was appointed for nearly three years to HMS Savage, Captain Burgess, a 16-gun ship-rigged sloop built at Ipswich in 1778.
		On 26th July 1784 James changed his surname by Royal Licence to Mortlock, in accordance with a Mortlock pedigree held in the College of Arms and so certified in a letter signed by Isaac Heard, Garter King of Arms, produced by James in January 1790 when he went up for Lieutenant.
		James gave the position of the south-easterly point of this (Satawan) atoll as 5°17'N, 153°28'E. Not the least interesting point is that Mortlock’s longitudes are exact, only a few years after the first chronometers were introduced into use.
	www.mortlock.info /encyclopedia/islands2.html (3814 words)

	Re: Railroad Chronometers: Why Antique Railroad Watches today deserve to be called Chronometers
		They were never timed to or certified by the COSC, which owns the name chronometer.
		Seiko ultimately had to stop calling their GS watches chronometers in the 1960's, although they easily outperformed the swiss standard.
		I think that by trying to call RR watches something they never were, it actually dilutes their well known contribution to railroad history and safety.
	www.talkaboutprofessions.com /group/alt.horology/messages/59641.html (1523 words)

	certified rolex submariner (Site not responding. Last check: 2007-10-14)
		Rolex Submariner Certified date reference 14060M which is less than one year old purchased June 2003.
		rolex watches have produced nearly 4oo, ooo Officially Certified wrist date, Whether days or decades old, a certified used Rolex Submariner watches always is a good investment.
		Certified This is an Authentic Original Rolex Submariner Watch with Original Docs and.
	www.searchingthedesktop.com /watches/certified-rolex-submariner.html (261 words)

	Ikepod Photo Gallery - Platypus (Site not responding. Last check: 2007-10-14)
		Platypus - Blue Face – 25 viewsThe Platypus is Ikepod's first women's watch and also the first square case in the collection.
		The movement is based on an ETA 2671, and the watches are C.O.S.C certified chronometers.
		Each version of the dial was produced in a limited series of 9999 in stainless steel and 999 gold.
	www.ikepodcentral.com /gallery/thumbnails.php?album=5 (319 words)

	Bifora "Unima" Chronometer (Site not responding. Last check: 2007-10-14)
		According to Fritz von Osterhausen in "Wristwatch Chronometers", the vast majority of wristwatches certified as chronometers in West Germany were tested at the Watch Testing Agency of the State of Baden Wurttemburg which initiated services in 1955 and terminated them in 1967 when Jungans stopped submitting watches.
		During this period Jungans was responsible for an overwhelming portion of the tested watches, almost certanly accounting for well over 90% of the estimated 130,000 cumulative total.
		Bifora, the brand used for watches produced by the J. Bidlingmaier firm, appears to have certified perhaps an average of 100 watches per year, or a bit over 1000 in total.
	www.ninanet.net /watches/others07/Mediums/mbifora.html (298 words)

	Detent escapement
		Nowadays there are only marine chronometers still have such a pretty nice regulator.
		Pocket chronometers were in demand just to synchronize time between timekeepers (for example between observatory and town reference clock).
		Fig.6 J. Calame Robert chronometer with pivoted detent.
	www.horology.ru /articles/detent.htm (466 words)

	Chronocentric - The Wristwatch Information Exchange
		In 1999, Rolex accounted for 584,607 (62%) of the 946,536 passing certified movements.
		The remaining brands each account for less than 3% of the total chronometers for the year.
		Omega has also confirmed that within the Seamaster Professional line that "the actual bicolors and Seamaster Professional Diver with white dial will be discontinued." Presumably, many models in the current Deville line will also be retired to make way for the new Deville collection.
	www.chronocentric.com /articles/news_omega_archives.shtml (2070 words)

	Grenon's of Newport - Breitling Watches (Site not responding. Last check: 2007-10-14)
		All Breitling watches, whether quartz or mechanical, men's or women's, are submitted to the Contrôle Officiel Suisse des Chronomètres (COSC) and are certified chronometers.
		Simply put, each watch is submitted to this facility to be tested for accuracy in various positions and at various temperatures.
		Only the most accurate watches that pass this rigorous test are labeled officially certified chronometers, and every Breitling watch you buy today has passed this test.
	www.grenonsofnewport.com /breitling.html (269 words)

	Welcome to our watch information page (Site not responding. Last check: 2007-10-14)
		Rolex has manufactured more than half of all swiss certified chronometers
		Explorer: Entry level professional series watch, certified chronometer, Arabic numbers and fl dial only, originally created for first ascent of Mt. Everest
		Oyster Perpetual Date: Calendar, certified chrono, Oyster bracelet only, in steel, in steel and gold, in all gold
	www.jewelry-wholesalers.com /watchinfo.htm (1016 words)

	Business Links
		Direct manufacturers of asme section viii - nb certified safety relief valve.
		Get free credit counseling from our certified credit counselors, qualified by nfcc.
		We offer a variety of clocks and related collectibles including traditional clocks and novelty chronometers for every room and need.
	www.aaacredit.net /links2.html (2221 words)

	Railroad chronometers Details, Meaning Railroad chronometers Article and Explanation Guide
		Railroad chronometers Details, Meaning Railroad chronometers Article and Explanation Guide
		Railroad chronometers Guide, Meaning, Facts, Information and Description
		Page Contains Information, Facts Details or Explanation Guide About Railroad chronometers
	www.e-paranoids.com /r/ra/railroad_chronometers.html (309 words)

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