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Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003.
Here's another posting, on Fratello, describing how mechanical chronographs work -- Understanding the Mechanical Chronograph -- A Watchmaker Explains.
: 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)