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Pouce/Ligne Table
The pouce/ligne factors are marked usually on the lower edge of the rear plate of French movements.  
This table assists the repairer to select the correct pendulum length and to set the clock to rate.

This link will take you to a full explanation of Pouce/Ligne

by

David J LaBounty  CMC FBHI

Link to Article, Calculations and Tables

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© Sylvester A Crowley 1998 to date Wales United Kingdom