Talk:Marine chronometer

message: Basically a B-class.
Certainly High importance, due to its intrinsic contribution to precision longitude calculation.
Want to help write or improve articles about Time? Join WikiProject Time or visit the Time Portal for a list of articles that need improving.
—Yamara ✉ 16:42, 7 May 2008 (UTC)
thread_title:  [[Wikipedia:WikiProject_Time/Assessment|WikiProject Time assessment rating]] comment 

message: The phrase under Today is inadequate for this article:
"GPS, and atomic clocks, have made mechanical clock-chronometers obsolete."
This is probably true for mechanical watches and chronometers, but it is certainly not true for digital chronometers. As one web site points out, "Murphy's Law was invented on a small boat at sea." GPS units can be lost or fail to work. Signals can be lost. They can also be blocked, or the satellites or transmitters destroyed, in a conflict. The U.S. Coast Guard still requires the knowledge of sextant use for its examination. A precise and accurate chronometer is still needed at sea today.
That leads to the definition in the article of a marine chronometer being mechanical. It need not be. It simply needs to be the most accurate, autonomous clock available for use at sea. --Parsa 01:49, 23 September 2007 (UTC)
thread_title: Definition and chronometers today

message: The section on escapements, escape wheels, etc is confusing.  Could it be rephrased into simpler terms, or could the terms used be defined for the lay public? --Badger151 (talk) 03:38, 26 September 2008 (UTC)
thread_title:  Mechanical chronometers confusing 

message: Redundant?  — Preceding unsigned comment added by 68.126.178.74 (talk) 09:11, 5 June 2011 (UTC)
replies: text: Necessary and sufficient is not redundant. For some result something may be necessary, but that may not be the only thing required to obtain that result. On the other hand, necessary and sufficient means that something is necessary and nothing else is needed to obtain the result. — Joe Kress (talk) 01:57, 6 June 2011 (UTC)
thread_title:  Necessary and sufficient? 

message: The deviation of a normale quarz clock / watch is up to 30 seconds  per month, not per year.
Example: Casio states in its manuals that the accuracy is + / - 30s per month. Thats for watches priced around 40 € - 200 €. 
--88.153.183.57 (talk) 00:13, 16 February 2012 (UTC)
replies: text: The reference cited in the article lists many watches with seconds per year accuracy, most costing hundreds or thousands of Euros. According to  ordinary quartz watches have a typical accuracy of 15 seconds per month, but thermocompensated quartz watches have a typical accuracy that is better than 15 seconds per year. — Joe Kress (talk) 00:02, 19 February 2012 (UTC)
thread_title:  Accuracy  of  quarz clocks 

message: When reading the article you get the impression that technology jumped from mechanical chronometers to GPS more or less instantly. That is of course not quite true. While many purely mechanical chronometers where still in regular use until GPS era they where not the only ones.
In the 60s electronic quartz marine chronometers became available with advantages over purely mechanical counterparts. Many of them even back then where capable of a precision within 10 seconds pr. year or even less. The advantages of the electronic quartz models is not only the greater overall precision but they're also less temperature sensitive which means that when calculating offset it'll be closer to reality then if using a mechanical - the rate is more stable than a mechanical. Add to that more rugged and they don't need winding - just battery replacing once in a while (once a year typical in order to continue running but can vary from model to model). Those electronic ones were the most common ones in the 70s and well into the GPS era as backup system before being replaced for a more integrated solution (on especially larger vessels).
There were also made tuning fork marine chronometers but to my knowledge they didn't play a major part in history as they where neither the first electronic ones or the most precise.
 — Tilt u (talk) 11:42, 4 January 2013 (UTC)
thread_title:  Electronic marine chronometer 

message: It is suggested by Katy Barrett/Eoin Phillips that the word Chronometer was "First used by the clockmaker William Derham in 1713, the word was picked up by other projectors, notably the potential Scriblerian scam Jeremy Thacker" see their essay on the Chronometer here: http://cudl.lib.cam.ac.uk/view/ES-LON-00003/1. Irisbox (talk) 15:01, 23 July 2013 (UTC)
thread_title:  First use of the word "Chronometer" in 1713 by William Derham rather than in 1714 by Jeremy Thacker? 

message: For a few years I was a Radio Officer in the British Merchant Navy.  One of my daily duties was to tune in to a source of time signals, perhaps WWV or the B.B.C., and the duty Deck Officer would record the ship's chronometer error.  
I was told that the absolute accuracy of the Chronometer was much less important than a daily record of its error.  In the absence of a time signal for a few days, not unusual in the Pacific where reception was frequently poor due to static, the error was interpolated from the chronometer's log. 
It was a predictable error which was held in high esteem.  
Syncopator (talk) 18:22, 26 July 2013 (UTC)
thread_title:  A user's pragmatic definition of a marine chronometer.   

message: Hello fellow Wikipedians,
I have just added archive links to  on Marine chronometer. Please take a moment to review my edit. If necessary, add  after the link to keep me from modifying it. Alternatively, you can add  to keep me off the page altogether. I made the following changes:
*Added archive https://web.archive.org/20101231055940/http://www.dodtechmatch.com:80/DOD/SuccessStories/View.aspx?id=60141 to http://www.dodtechmatch.com/DOD/SuccessStories/View.aspx?id=60141
When you have finished reviewing my changes, please set the checked parameter below to true to let others know.
Cheers.—cyberbot IITalk to my owner:Online 05:03, 20 January 2016 (UTC)
thread_title:  External links modified 

message: It claims..." Timepieces made in Switzerland may display the word 'chronometer' only if certified by the COSC (Official Swiss Chronometer Testing Institute).", this is not correct. Certified Marine Chronometer watches have been made in Switzerland that have the word Chronometer on them, but they are not certified by COSC, but by a different agency in France.  — Preceding unsigned comment added by 208.118.28.7 (talk) 13:13, 22 January 2016 (UTC)
thread_title:  Has an incorrect claim 

message: Hello fellow Wikipedians,
I have just modified 2 external links on Marine chronometer. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added  tag to https://library.mysticseaport.org/initiative/ImPage.cfm?BibID=13617&ChapterId=32
*Added archive https://web.archive.org/web/20110609125114/http://www.cotsjournalonline.com/articles/view/100409 to http://www.cotsjournalonline.com/articles/view/100409
*Added archive https://web.archive.org/web/20111212075532/http://www.nmm.ac.uk/ to http://www.nmm.ac.uk/
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 16:41, 17 January 2018 (UTC)
thread_title:  External links modified 

message: Hello fellow Wikipedians,
I have just modified one external link on Marine chronometer. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20140325173508/http://www.anthonygrayclocks.com/horological-timeline.htm to http://www.anthonygrayclocks.com/horological-timeline.htm
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 18:49, 25 January 2018 (UTC)
thread_title:  External links modified (January 2018)