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  1. #16
    Registered User gmorse's Avatar
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    Default Re: Le Brun, Pocket Watch movement. (By: Omexa)

    Hi Ray,

    It's just occurred to me that those empty holes on the edge of the top plate are similar to the mounting holes for the detent foot on a chronometer escapement. What shape are the escape wheel teeth? I know this seems unlikely, but could it possibly have been converted from a chronometer?

    Regards,

    Graham

    "Ut tensio, sic vis" - Robert Hooke

  2. #17
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    Default Re: Le Brun, Pocket Watch movement. (By: gmorse)

    I take Graham's point about the style of the backplate lettering, but the broad cock-table, the wide-rimmed balance and the dial with its residual minute track all suggest the 1820s to me. Perhaps this Le Brun converted and signed a thirty-odd-year-old movement which had previously been uninscribed. That potence between the plates near the release-catch looks to me like evidence of some kind of modification.

    Ray, how often have you seen five turns of fusee-chain on the barrel? I for one never have. I wish I had a spare chain like that; in fact I wish I had twenty such chains.

    Oliver Mundy.

  3. #18

    Default Re: Le Brun, Pocket Watch movement.

    Hi Oliver your point first,
    Ray, how often have you seen five turns of fusee-chain on the barrel? I for one never have.
    now you come to think of it neither have I. Now to Graham,
    What shape are the escape wheel teeth?
    The Escape Wheel does look like a Chronometer Escape Wheel. I wonder why it was converted? Maybe the Chronometer was a bit delicate and did not like rough weather. The next thing is was this movement in a Deck Watch? My Mercer Chronometer has 5 turns of Fusee Chain on the Barrel. Regards Ray Click image for larger version. 

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    Last edited by Omexa; 03-24-2017 at 10:57 AM.

  4. #19
    Registered User gmorse's Avatar
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    Default Re: Le Brun, Pocket Watch movement. (By: Omexa)

    Hi Ray,

    That is interesting. I wonder why somebody would go to the trouble of converting a detent escapement to a lever? I can only think that since pocket chronometers don't take kindly to too much physical exercise and tend to "set" if they're not treated gently, it was converted to a lever. Pocket chronometers weren't necessarily all deck watches, some were just for people with enough money to afford them. If it was converted, it may have been fitted with a new balance cock, although by no means all of these were free-sprung with a helical spring.

    Regards,

    Graham

    "Ut tensio, sic vis" - Robert Hooke

  5. #20

    Default Re: Le Brun, Pocket Watch movement. (By: Omexa)

    Hi Graham,
    That is interesting. I wonder why somebody would go to the trouble of converting a detent escapement to a lever?
    Trust me to find something unusual. Regards Ray

  6. #21
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    Default Re: Le Brun, Pocket Watch movement. (By: gmorse)

    The Joseph Johnson chronometer presented to Commodore Perry (U.S. Navy) in 1816 is stated in the NAWCC catalogue of its Johnson holdings to have a lever escapement; if this is correct it must surely be a subsequent conversion, although it is hard to imagine how anyone would dare to treat such a historic item in this way.

    Oliver Mundy.

  7. #22

    Default Re: Le Brun, Pocket Watch movement.

    Hi Oliver, I would love to see it how do I find it?
    The Joseph Johnson chronometer presented to Commodore Perry (U.S. Navy) in 1816 is stated in the NAWCC catalogue of its Johnson holdings to have a lever escapement
    I found it but it does not show the side images of the movement. Regards Ray
    Last edited by Omexa; 03-26-2017 at 02:38 PM.

  8. #23

    Default Re: Le Brun, Pocket Watch movement. (By: gmorse)

    From, Dr Jon,
    especially at Neuchatel had shown that the pivoted detent was not as good as the lever for precision timekeeping.
    I wonder if this was the reason that this movement was converted? Regards Ray

  9. #24

    Default Re: Le Brun, Pocket Watch movement. (By: Omexa)

    Hi, I have just been watching the series "Lovejoy" about a dodgy Antique Dealer. Mentioned in the series was that Scrap Dealers put "Bullion before Beauty" and I thought that it fit in with Pocket Watch Cases.
    Hi Graham, I had to take the Dial off anyway because when the Gold Case was ripped off the Hinge went with it.
    Regards Ray

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