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Here's another posting, on Fratello, describing how mechanical chronographs work -- Understanding the Mechanical Chronograph -- A Watchmaker Explains.
Jeff
++++++++++++++++++++++++++++++++++++
: I will not claim to have read it carefully, and can't vouch for
: its accuracy, but based on the quick skim, this is one hell of a
: posting --
: How Column-wheel Chronographs work (notably, the Lange L951 series)
: --
: https://www.reddit.com/r/Watches/comments/3l6oy0/technical_how_columnwheel_chronographs_work/
: Jeff
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