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    Re: Longines A-7 Avigation Hack Watch
    From: Bill Lionheart
    Date: 2017 Sep 29, 21:36 +0100

    Hack was the term for something to do routine work, especially a
    horse, but my father born in 1927 would apply it anything such as a
    vehicle used for routine rather than special purposes.
    It was also used for a writer or journalist who similarly did routine work.
    So it is entirely consistent that a hack watch was just that, the
    watch for routine use while the chronometer was more special.
    On 22 September 2017 at 19:43, Peter Monta  wrote:
    > In watchmaking I believe "hack" means to stop the balance (the
    > hairspring-and-wheel resonator that keeps time in mechanical watches) by
    > some external means.  A watch with a hack feature might include a small
    > button on the case which, when pressed, would (gently!) force a braking pad
    > against the balance wheel, stopping it.  Releasing the button and giving the
    > watch a flick (imparting some rotation to the balance to get it running
    > again) can start the watch with sub-second precision.  Care must be taken
    > not to flick too hard to avoid damaging parts of the escapement.
    > I don't know how the hack feature is implemented on a wristwatch when
    > pulling out the stem.  Does the balance actually stop, or is the seconds
    > hand merely decoupled from the still-running train?
    > It sounds to me like the navigational use of "hack" in "hack watch" is
    > unrelated.  In particular, you probably don't want to hack a hack watch.
    > Hacking is crude---generally you want the watch to run continuously for best
    > performance.  Chronometers would never be hacked, and even hacking a deck
    > watch strikes me as poor practice.
    > Cheers,
    > Peter
    > View and reply to this message
    Professor of Applied Mathematics
    University of Manchester

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