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  1. #46
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    Default Re: Marine Chronometer Gallery (By: burt)

    My waterproof, shock resistant, anti-magnetic chronometer

    It's a bit large for my wrist even with the gross trend to big wrist watches.
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    It weighs about 11.6#.

    It has a make break circuit that does work and it's an odd pattern, in that it is not the same as the published examples I have seen but I do not recall what it is.

  2. #47

    Default Re: Marine Chronometer Gallery (By: Dr. Jon)

    Dr. Jon, nice config! Instead of on your wrist, maybe in a "fanny pack", with the break-circuit wired to a FitBit on your wrist? You can measure the escapement "trips" ...
    Member Chapter 149

  3. #48
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    Default Re: Marine Chronometer Gallery (By: Dave Chaplain)

    Bulova Model TE-18 Navigation Timepiece Experimental Model.......




  4. #49
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    Default Re: Marine Chronometer Gallery (By: Accutronitis)

    Re Dave,

    I was thinking of posing with it on my arm and submitting it to the What are you wearing thread in wrist watches.

    I have measured the intervals with a continuity meter, I just do not recall what the pattern was except that Tom Mcintyre had a description of two sequences and mine differed from both of them.

  5. #50

    Default Re: Marine Chronometer Gallery (By: Dr. Jon)

    Dr. Jon, make sure you set your arm on a support to photograph your wrist mounted chrono, else you'll pull a muscle! And your M21 reminds me that I have an unusually marked one (marked "Sample 75"), which also has a break circuit, which Bill Tapp took a quick look at and commented that it seemed to have something unusual going on under the dial. I'll have to make some time and take a closer look.
    Member Chapter 149

  6. #51

    Default Re: Marine Chronometer Gallery (By: Dr. Jon)

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


    Ralph

  7. #52
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    Default Re: Marine Chronometer Gallery (By: Ralph)

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

  8. #53
    Registered User Norman Bliss's Avatar
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    Default Re: Marine Chronometer Picture Gallery (By: Dr. Jon)

    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/
    Norman Bliss

  9. #54

    Default Re: Marine Chronometer Picture Gallery (By: burt)

    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
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  10. #55
    Technical Admin Tom McIntyre's Avatar
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    Default Re: Marine Chronometer Picture Gallery (By: BAC)

    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.
    Tom McIntyre Click me.
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    Will Rogers

  11. #56

    Default Re: Marine Chronometer Gallery (By: burt)

    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.



    (Pictures courtesy of Leigh Extence, Exeter.)




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

    Marco
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  12. #57
    Technical Admin Tom McIntyre's Avatar
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    Default Re: Marine Chronometer Gallery (By: Marco C.)

    Very nice and complete. 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?
    Tom McIntyre Click me.
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  13. #58

    Default Re: Marine Chronometer Gallery (By: Tom McIntyre)

    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...)

  14. #59
    Registered User gmorse's Avatar
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    Default Re: Marine Chronometer Gallery (By: Tom McIntyre)

    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

    "Ut tensio, sic vis" - Robert Hooke

  15. #60
    Technical Admin Tom McIntyre's Avatar
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    Default Re: Marine Chronometer Gallery (By: gmorse)

    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.
    Tom McIntyre Click me.
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