Chronometry: Anyone know when Mercer's switched detents?

Discussion in 'Chronometers' started by DeweyC, Mar 23, 2016.

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  1. DeweyC

    DeweyC Registered User
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    I remember being told Mercers went to the milled detent in the 1930s (Jim Connors maybe?). Look as I might through various Mercer books, I cannot find a changeover date or serial number.

    Does anyone have this info? Driving me nuts (OCD)
     
  2. burt

    burt Registered User
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    Dewey,

    I remembered you asking this question and today was looking for something else and I think I stumbled on to the answer? Pictured on page 295 in Tony Mercer's book "Chronometer Makers of the World" is pictured (drawn) A Mercer detent marked pre 1937. My book is marked "revised edition" so if you are not referencing that copy you may not find it on that page or perhaps not in the earlier issue? There is no other reference as to serial number of exact date. As no one has come up with the answer I thought I 'd post what I found. Didn't want to copy the book picture and post as I don't want to violate any copy right rules. Is this what you were looking for?
     
  3. Allan C. Purcell

    Allan C. Purcell Registered User
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    Hi OCD,
    For education puroses, you can I believe use some photographs, and I take it you must give credit. so the photograph below is from
    Tony Mercers "Chronometers of the World" revised edition.
    Regards,

    allan.
    IMG_4297.JPG
     
  4. burt

    burt Registered User
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    #4 burt, Dec 16, 2017
    Last edited: Dec 16, 2017
    Allan,

    As didn't say anything about it in "my" post how did you guess about the O.C.D.? :) Oh by the way shouldn't look like this? :) On a serious note I can't imagine why Tony Mercer would include that picture and then draw a clear line of demarcation (1937) if it were not for a major change in the detent of their chronometers.I hope that is what Dewey was looking for?

    IMG_20171216_0001.jpg
     
  5. Jerry Freedman

    Jerry Freedman Registered User
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    See page 220 in the book Mercer Chronometers and look at 1937.

    Jerry Freedman
     
  6. Tom McIntyre

    Tom McIntyre Technical Admin
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    Although a bit off topic, the principle of fair use of an extract does not generally apply to images that are considered a "complete work" in their own right. However, with the digital age, the concept of a reduced quality reference image used to refer to the original image is treated the same as "fair use." I think the copies shown above would be a qualified use.

    The images in the NAWCC Museum catalog of artifacts are all of sufficiently low resolution that they may be freely used. If one wants a high resolution image of an artifact, it can be licensed for commercial work or for non profit educational use with an appropriate contract. I believe the British Museum has the same or very similar policy.
     
  7. Allan C. Purcell

    Allan C. Purcell Registered User
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    Thanks Jerry-how did you manage to remember that.

    Merry Christmas.

    Allan.
     
  8. tick talk

    tick talk Registered User

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    If I may ask for more clarification; is there a time limit on the copyright of original images? I've heard 100 years from some sources, and 60 years after the death of the author from other sources. Perhaps the latter only applies to written material...

     
  9. Tom McIntyre

    Tom McIntyre Technical Admin
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    In the most common case copyright is 70 years after the death of the author. If the work was not produced by an author, it is 95 years or 120 years after publication or production respectively. Here is the short PDF from the U.S. Copyright Office. Wikipedia has several good articles on the subject that cover the international rules.
    circ15a.pdf
     

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  10. Allan C. Purcell

    Allan C. Purcell Registered User
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    Hi Tom- I was reading Mercer Chronometers again last night, and came across Jerry Freedman´s 1937 remark on page 220. I then read on.
    on the same page is 1939, the year of course we went to war, and all chronometers had to sold to the government. It goes on to say the Horological Journal
    regarding Thomas Mercer Ltd. "For a technician, Mercers is an Alladin´s cave. Its wonders never cease but grow with acquaintance". . Your could say that
    about this board, what say you?


     

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