The 'Virgule' escapement...  

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Virgule escapement.
Virgule escapement ZoomUnder


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 How it works... 


1/. A tooth of the escape-wheel rests on the outside of the Virgule.




2/. The tooth drops into the Virgule - it is now on the axis of the Balance, and stays put...

3/. As the tooth leaves the Virgule, it sweeps along the 'tail' of the Comma, giving the impulsion.

 Detail of the impulsion, seen from beneath.