Marine: Marine Chronometer Picture Gallery

Discussion in 'Chronometers' started by burt, Sep 9, 2015.

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  1. Ralph

    Ralph Registered User
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    Jan 22, 2002
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    Re: Marine Chronometer Gallery

    Dr Jon, I believe these were called "Bean Pots". I have serial 2E12656. I think they were used for surveying.


    Ralph
     
  2. Dr. Jon

    Dr. Jon Registered User
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    Re: Marine Chronometer Gallery

    That is my belief also but they might also be useful for bodybuilding if worn as wrist watch, or even a fanny pack
     
  3. Norman Bliss

    Norman Bliss Registered User
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    Well, don't visit the board for a while, and look what happens. A fun new forum shows up!

    Instead of posting my chronometers, here's a link to my John Bliss virtual museum with my Bliss chronometers: http://blisschron.org/
     
  4. BAC

    BAC Registered User

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    SN 4E009 was one of two civilian 221's owned by a family operating two tuna boats on the west coast. This is likely why the serial numbers match on the chronometer and inner and outer boxes. It has been in my collection since 1996.

    Brian Carlin
     
  5. Tom McIntyre

    Tom McIntyre Technical Admin
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    I wonder if their fishing took them across the date line. It was my understanding that the date line service was what led to the 221 design.
     
  6. Marco C.

    Marco C. Registered User

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    Re: Marine Chronometer Gallery

    Here is mine. J/5816 chronometer by McGregor of Glasgow and Greenock, movement No. 5763 (possibly by Johannsen). Double auxiliary of Poole (for extreme cold) and Eiffe (for extreme hot). Fancy coromandel box by George Thompson of Hull. With carrying case.

    Bought by the Admiralty in 1916 and assigned to HM tug “Golden Crown”. Documented in Sidney, Freetown and Gibraltar.

    [​IMG] [​IMG] [​IMG] [​IMG]

    (Pictures courtesy of Leigh Extence, Exeter.)


    [​IMG] [​IMG]

    (Images of ledger courtesy of the Horology Department, Royal Observatory, Greenwich.)

    Marco
     

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  7. Tom McIntyre

    Tom McIntyre Technical Admin
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    Re: Marine Chronometer Gallery

    Very nice and complete. :coolsign: The Eiffe auxiliary looks a lot like Airy's bar except that there is no bar to turn it on. Can someone describe the theory of operation of the Eiffe?
     
  8. Marco C.

    Marco C. Registered User

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    Re: Marine Chronometer Gallery

    Two symmetric springs are screwed to the internal part of the balance rims (corresponding to the timing screws). These springs have additional weights at their free extremities. With medium or low temperature the balance rims do not touch the free extremities of the internal springs. When the balance rims contract in high temperature, at a certain point they come in contact with the springs and start carrying the two weights toward the center of the balance, causing an additional decrease in the balance inertia. (I hope my English is understandable...)
     
  9. gmorse

    gmorse Registered User
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    Re: Marine Chronometer Gallery

    Hi Tom,

    Marco's explanation is excellent. The basic concept is the same as Molyneux', and Airy knew of both more or less at the same time, but it was Molyneux who secured the patent. See page 181 of Gould.

    Regards,

    Graham
     
  10. Tom McIntyre

    Tom McIntyre Technical Admin
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    Re: Marine Chronometer Gallery

    In Airy's implementation, there is no "middle temperature" effect, it just changes the "set point" for the compensation to adapt to average heat or cold. The weights are always in contact with the inner side of the rim.

    Those weights out there at the end of a light spring seem like they would be subject to centrifugal error which would harm isochronism. i.e. their average radius would change with amplitude.

    I guess I need to sit down and read Gould again.
     
  11. gmorse

    gmorse Registered User
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    Re: Marine Chronometer Gallery

    Hi Tom,

    This was in the context of Sir George Airy's rôle as Astronomer Royal rather than as an inventor himself.

    Regards,

    Graham
     
  12. Allan C. Purcell

    Allan C. Purcell Registered User
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  13. Allan C. Purcell

    Allan C. Purcell Registered User
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    I would really like to read this thread but all the threads are blank. Just photographs what do I need to do to get the text``
     
  14. Allan C. Purcell

    Allan C. Purcell Registered User
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    All´s well that ends well-I hope it ends soon.
     
  15. Dave Chaplain

    Dave Chaplain Registered User
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    Hi Alan,

    I see both text and pictures here on my browser (Google Chrome) so I don't know what to tell you. Are you signed in? Maybe try a different browser to see if your results change?

    It just occurred to me that you may not be able to read my note here, so I'll PM you! lol

    Dave
     
  16. Tom McIntyre

    Tom McIntyre Technical Admin
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    I tried using a different font color in another reply to Allan. Maybe that will work here. I will check if the software is being unkind to him personally.
     
  17. John Matthews

    John Matthews Registered User

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    Tom - Allan has also posted the same problem here

    Roskells of Liverpool and London

    It looks as if he has been hitting his keypad, almost at random, possibly because he doesn't see the characters - I wonder if it is something to do with an incompatible character set on the browser he is using.

    John
     
  18. Tom McIntyre

    Tom McIntyre Technical Admin
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    I am sure it is very frustrating for Allan. I see some unlauts in his random typing so I presume he is using a German keyboard. I wonder if his isp may object to something on our site and is trying to protect him?

    If he is using a high contrast display, the text color may fall under some threshold and render as white on white also.

    He also says he cannot see the login indicator unless he hovers over it, which may be a clue.

    topscreenlogin.png
     
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