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Topic: Chronometer


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In the News (Tue 26 Mar 19)

  
  Evolution of a Design: Ulysse Nardin Marine Chronometer
In spite of the widespread enthusiasm, with which the community of watch lovers greeted the new "Marine", there are also some voices, criticizing the design as being too "modern", too far away from the classic naval precision clocks, even hampered by a mix of different styles in hands and numerals.
This is problematic, since at bad light (and at sea, the marine chronometer were normally stored well protected in a corner of the rudder house/map room, where it was rather dark), the legibility was seriously compromised.
At the end of the 19th century, most "legible" watches used exactly this type of hands, as opposed to the highly ornamental Louis XV and XVI style hands, or the elegant so-called "Breguet"-hands (Breguet did not invent this hand design, but was among the first to use it consequently).
www.tp178.com /mh/un_pics/UN_Marine_Design.html   (1099 words)

  
  Checking the Chronometer
If it had not, it is understandable that the captains felt it imperative to discover the chronometer's error and rate of loss or gain.
It didn't matter if the chronometer stopped or ran erratically most of the time provided it ran uniformly between two Equal Altitudes observations a day or, perhaps, two apart during which a Lunar Distance observation was made.
The uncertainty about the chronometer's error on Local Time for September 30 and its rate of loss between September 30 and October 3 produces some uncertainty about any longitude calculated from that day's Lunar observations, but there are ways around this problem.
www.lewis-clark.org /content/vws_bergo-canoecamp4.htm   (405 words)

  
  COSC - Contrôle Officiel Suisse des Chronomètres
The term chronometer is often wrongly applied to timekeeping instruments fitted with an additional mechanism that may be set in motion by pushbuttons to enable measurement of the duration of an event.
A chronometer is a high-precision watch capable of displaying the seconds and housing a movement that has been tested over several days, in different positions and at different temperatures, by an official neutral body (COSC).
Each chronometer is unique, identified by a number engraved on its movement and a certification number given by the COSC.
www.cosc.ch /chronometre.php?lang=en   (166 words)

  
  Chronometer
A chronometer is a clock designed to have sufficient long-term accuracy that it can be used as a portable time standard on a vehicle, usually in order to determine longitude by means of celestial navigation.
Balance wheels for chronometers used bi-metallic strips to move small weights toward and away the center of the wheel, in order to adjust the period of the balace wheel for the temperature of the chronometer.
A chronometer's escapement is usually designed to minimize the energy and time required to unlock the escapement, so that it affects the resonant frequency of the oscillator as little as possible.
www.guajara.com /wiki/en/wikipedia/c/ch/chronometer.html   (589 words)

  
 Halfbakery: Self winding Chronometer
For those proud few, a chronometer is a must, and not just any chronometer, but a mechanical one, a swiss precision, marine grade clockwork masterpiece, almost capable of going toe to toe with the atomic clocks as far as reliability is concerned.
Why a chronometer that would be self winding should not be available is a mystery to me. Chronometers are designed to be used on ships, which tend to rock at least a little due to the fact that they spend their time floating on water.
Chronometers for use on long sea voyages had to be extremely accurate even by modern consumer-product standards.
www.halfbakery.com /idea/Self_20winding_20Chronometer   (1066 words)

  
 Chronometer Summary
A carpenter's son and a self-taught carpenter, John Harrison (1693-1776) invented a chronometer that was successfully employed on a voyage to Lisbon in 1736.
A chronometer is a timekeeper precise enough to be used as a portable time standard, usually in order to determine longitude by means of celestial navigation.
To compensate for ever-changing spring strength, the majority of chronometer balances used bi-metallic strips to move small weights toward and away from the center of oscillation, thus altering the period of the balance to match the changing force of the spring.
www.bookrags.com /Chronometer   (3660 words)

  
 The Chronometer and Regulator Collection
They also achieved a certain popularity in England particularly in northern counties and may have been a way of protecting assets at a time when bank failures were commonplace.
This chronometer was made c.1830 by Richard Hornby, Liverpool, working 1814-51.
Chronometer manufacturing was the one area of the horological industry largely unaffected by foreign competition during this century.
www.stedmundsbury.gov.uk /sebc/visit/thechronometerandregulatorcollection.cfm   (869 words)

  
 [No title]
Chronometers by Parkinson and Frodsham are considered to be of the finest workmanship.
The chronometer has a good quality movement, subsidiary dials for seconds and state of wind, and gold hour and minute hands.
The chronometer has the serial number 1850 internally on the back of dial, on the front plate and on the underside of the balance cock; this is the serial number of Thomas Mercer who made this instrument, McGregor's being the retailer.
www.antique-horology.org /hereismore/Nomenclature/chronometer.htm   (1447 words)

  
 Chronometer: Free Encyclopedia Articles at Questia.com Online Library   (Site not responding. Last check: 2007-11-05)
CHRONOMETERS AND UNITS IN EARLY ARCHAEOLOGY AND PALEONTOLOGY...artifacts, but differences in the units that allowed the chronometers to be operationalized reveal significant epistemological...paleontologists 1 and similar though not identical chronometers, or devices for measuring the passage of time.
The difference...minutes) is satisfactory; a chronometer is used for navigation, scientific work...language, both the wristwatch and the chronometer are said to be reliable.
He soon became an expert in the making of chronometers and by 1812 was fashioning most of the superior ones used...position of stars, and he was a pioneer in the use of the chronometer and the telegraph for determining longitude.
www.questia.com /library/encyclopedia/chronometer.jsp?l=C&p=5   (1584 words)

  
 chronometer - Search Results - MSN Encarta
Chronometer, device that keeps time with great precision (Clocks and Watches).
Carefully constructed mechanical timepieces known as chronometers are precision devices used by navigators in the determination of their longitude at...
Concern over national stores of minerals and costs associated with environmental problems caused many mining companies to make enormous financial commitments to obtain minerals from the sea.
encarta.msn.com /chronometer.html   (131 words)

  
 Negus Chronometer   (Site not responding. Last check: 2007-11-05)
The marine chronometer was the primary instrument used throughout the nineteenth and most of the twentieth centuries to calculate one's longitude at sea.
Therefore the chronometer had to be a superbly made instrument.
The chronometer was invented in Englad in the late 18th century and the majority were built in England throughout the nineteenth century.
www.aagaines.com /man/negus.html   (315 words)

  
 Marine Chronometers Gallery
The demand for chronometers fell off as the age of exploration drew to a close, but was temporarily revived by the need for navigational instruments during both World Wars.
Chronometer is a widely used term that usually fits one or more of the following definitions.
A clock with a chronometer escapement which is a spring detent.
www.nawcc.org /museum/nwcm/galleries/marine/marine.htm   (405 words)

  
 Poljot 6mx Marine Chronometer, Poljot Desk watch, Russian mechanical stopwatches
6MX marine chronometer was developed by the experts of The 1-st Moscow Watch Factory in 1947 and meant for keeping of exact time in hours, minutes and seconds on ships and vessels of all types.
Since then 6MX marine chronometer was exported to many counties such as Germany, Finland, Japan, Italy, USA and other counties.
Chronometer is mounted in a wooden case and a box made of special firm sort of wood lacquered into the color of mahogany.
www.russianwatch.net /poljot_6mx_marine_chronometer_and_desk_watch.shtml   (525 words)

  
 Bryer and Sons 8 day Chronometer
The Marine Chronometer is regarded by many horoligists and collectors as one of the supreme accomplishments of late 18th century and 19th century invention and engineering.
The chronometer was an absolute necessity for navigators at sea as it enabled them to accurately find their longitude.....previous to its invention 'Dead Reckoning' was often an all too real a situation rather than a quaint expression!
This was found to be too short a duration given that the chronometer must never be allowed to run down at sea, typhoons and naval battles not withstanding.
www.aagaines.com /clocks/bryer.html   (381 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
James Cook used Harrison’s chronometer to circumvent the globe and when he returned in 1779 his calculations of longitude based upon the chronometer proved correct to within 8 miles.
Chronometer competitions began in Neuchatel in 1866, and Geneva in 1873, and ended in Neuchatel in 1975, and Geneva in 1967; for wristwatches, competitions ran from 1945 through 1967.
The purpose of these tests was to spur competition and innovation, disseminate technical information and discoveries to advance chronometer research, and of course to provide publicity and acclaim for the manufacturer in selling their more ordinary watches.
www.lycos.com /info/chronometer.html?page=2   (467 words)

  
 House of Longines: Chronometer
The 21.29 was one of the worlds great chronometer movements fitted in various types of cases and boxed (gimballed) chronometers, including the famous siderograph of the 30’s selling right up to the early 1960’s.
The second was for taking the time from the main ship’s chronometer to the deck, for the shooting of the sun at mid-day, to check daily on the ships position.
The Longines chronometer was classified by the navy as a mounted chronometer watch, then later called the gimballed chronometer watch, and prior to 1943 were tested under the deck watch specifications.
timewatches.us /Longines/e/chm/jh.html   (2356 words)

  
 NMAH | Bond Marine Chronometer
To use a marine chronometer, outbound sailors would set their timepieces to the time of a known port's longitude—say Greenwich, England, or Boston.
Chronometers were uncommon aboard American ships at the time, and the Cyrus's captain warned Bond to read the record of the instrument's performance with a critical eye.
Most of the chronometers ran from the force of an unwinding spring and had a special feature—the detent escapement.
americanhistory.si.edu /collections/object.cfm?key=35&objkey=155   (313 words)

  
 The Story of the Bounty Chronometer
The Chronometer was tested and then given to John Phipps for his unsuccessful attempt to find a Northwest passage in 1773.
The Chronometer appears next at Concepcion in Chile, where it was purchased for three doubloons by an old Spanish muleteer by the name of Castillo.
When the Chronometer was later examined by the Horologist Peter Amis at Greenwich he remarks "it did not take long to ascertain that in order to simplify Harrison's design, and thus construct it for £200, that Kendall had committed the cardinal error of dispensing with the train remontoire.
www.lareau.org /chrono.html   (1272 words)

  
 chronometer - HighBeam Encyclopedia
A mechanical chronometer is a spring-driven escapement timekeeper, like a watch, but its parts are more massively built.
Changes in the tension of the spring caused by variations in temperature are compensated for by devices built into it.
Modern chronometers are electronic, using the vibrations of a quartz crystal to regulate the rate at which a time-indicating display moves.
www.encyclopedia.com /doc/1E1-chronome.html   (430 words)

  
 Vacheron Constantin Overseas Chronometer
My watch, the subject of this review, is a full sized automatic chronometer model with the blue dial and stick markers.
This is a photo of the GP-3100 movement (from a catalog), the base movement of the Overseas chronometer.
Here she is, reference number 42042/423A-8890, which in Vacheronese is an Overseas Chronometer, steel, fl dial with Superluminova arabic numerals.
www.tp178.com /ct/edelmanvcreview/ericedelmansVCreview1.htm   (3183 words)

  
 Chronometer Error
The time given by the chronometer for Local Apparent Noon, after a correction made for the sun’s changing declination and subtracted from 12:00:00, gives the error of the chronometer on Local Apparent Time for that particular noon.
From these data, the time that the chronometer would have shown at local noon could be calculated to within a second or so of noon — depending upon the accuracy of the observation.
Although the captains did not calculate the chronometer’s error while at the mouth of the Kansas River, Lewis would need to make these calculations to determine the magnetic declination and the longitude from the other observations he and Clark took there.
www.lewis-clark.org /content/content-article.asp?ArticleID=2682   (604 words)

  
 OMEGA Megaquartz 2400, Marine Chronometer of 1974
The Marine Chronometer that is directly to the left the the sign (w/ ID tag 173) has a case reference (circa 1974) ST 398.0836 with caliber 1511 movement.
The other Marine chronometer that is directly to the right of the Prototype has a case ref of ST398.0832 and uses the later caliber 1516 movement (circa 1976).
The Marine Chronometer 2.4 Mhz ST 398.0836 with caliber 1511 movement or ST398.0832 and uses the later caliber 1516 movement was price at 1850.00 USD.
home.xnet.com /~cmaddox/omega_megaquartz_2400.html   (626 words)

  
 Chronometer - WowAce Wiki   (Site not responding. Last check: 2007-11-05)
Chronometer uses the Ace2 framework, including CandyBar for the timer bars themselves.
When there are multiple NPCs with the same name, this becomes very inaccurage, since it has no way of knowing if the one that died was the same one that you cast the spell on intitially.
Right-clicking a Chronometer bar will force the bar to disappear - especially useful if you use long debuffs like Curse of Shadows and leave the /chron kill option off to avoid issues with duplicate NPC names.
www.wowace.com /wiki/Chronometer   (648 words)

  
 Science News - The Marine Chronometer
The marine chronometer or sea clock was the first precise instrument used to figure out distance between two locations.
By the end of the 18th century, accurate charts of the oceans, continents and islands were produced with the information obtained by naval explorers.
The development of accurate timepieces was the result of the invention of the marine chronometer.
www.manitobamuseum.mb.ca /sg_marine.html   (632 words)

  
 Be-Ba Competition chronometer, Peseux 260
The term "chronometer" began in 1715 with English watchmaker Jeremy Thacker, for a sea watch using a verge movement.
Chronometer competitions began in Neuchatel in 1866, and Geneva in 1873, and ended in Neuchatel in 1975, and Geneva in 1967; for wristwatches, competitions ran from 1945 through 1967.
The purpose of these tests was to spur competition and innovation, disseminate technical information and discoveries to advance chronometer research, and of course to provide publicity and acclaim for the manufacturer in selling their more ordinary watches.
www.ninanet.net /watches/others04/Mediums/mbeba.html   (982 words)

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