Chronographs

Discussion in 'European & Other Pocket Watches' started by kirxklox, Dec 13, 2007.

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  1. kirxklox

    kirxklox Registered User
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    Dec 17, 2002
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    What does the Numbers 0 - 300 represent on the outer Chapter Ring?
     
  2. Cary Hurt

    Cary Hurt Registered User

    Dec 16, 2005
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    Sam,

    Without seeing the dial you are referring to, I'd think it was 1/5 seconds.

    Cary
     
  3. kirxklox

    kirxklox Registered User
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    Courtesy 123pocketwatcher

    Try this:
     

    Attached Files:

  4. Richard Watkins

    Richard Watkins Registered User
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    Seconds - some chronographs had seconds hands that rotated once on 300 seconds - 5 minutes.
     
  5. Tom McIntyre

    Tom McIntyre Technical Admin
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    Aug 24, 2000
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    Richard,

    Do you have a reference for the 5 second sweep? The common center seconds chronograph has the 4th wheel planted in the center and is numbered to 300 around the dial for the 1/5 second ticks of the sweep hand.
     
  6. LloydB

    LloydB Registered User

    Feb 24, 2006
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    I agree... far more likely that it's 1/5 sec timing.

    I *believe* this is the typical layout for what's been termed
    a "doctor's watch" used for timing the pulse in some fashion
    that's not particularly clear to me. Perhaps for timing the
    intervals between PVC's, and the like.
     
  7. Tom McIntyre

    Tom McIntyre Technical Admin
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    These watches are called chronographs by their makers, but they are really hack watches. The feature is most likely used to synchronize the watch with a time standard so that the chronometer could be rated.

    Those with going barrel are usually pendant wind and button/nail set. Those with keywinding generally have fuzees.

    In use the watch would be set to 12:00 with the movement stopped and then started when the time ball dropped.

    Of course, it could be used for anything else one wanted.

    The confusion about these watches goes back a long way. Waltham actually made a sweep center seconds watch to compete with them that did not stop the movement, thinking it was used for timing. They did not sell at all well since they lacked the key feature of hacking.

    Here is a picture of the Waltham variety.

    66.jpg

    Here is a keywind example of the English watch.

    1.jpg

    There are writeup of both of these on my web site.
     

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