Ligne

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Paris ligne, duodecimal length unit of watchmakers


This traditional and in watchmaking still prevailing duodecimal length unit is derived from the former general basic unit "Paris foot". A "Paris foot" corresponds to 3247 mm.

  • 1 Paris foot (´) = 12 Paris inches (´´)
  • 12 Paris inches (´´) = 144 lignes (´´´)
  • 1 ligne (´´´) = 2.2558 mm or 0.08881 inches

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