![]() ![]() When you see three apostrophes ( ”’) after the number, it’s not a typo. Representing LignesĬaliber Corner posts as much information about each movement as possible – including the diameter in lignes and millimeters. If you don’t have a tool, you can convert mm to lignes the old fashioned way:Īnd conversely 1 mm = 0.4433 ligne. There are calipers and rulers that are set up for measuring lignes such as this one. In the past the French foot used to correspond to 12 inches measuring 12 lines each.Īmerican watchmakers also had their own measuring system for watch movements, more on that here. Each line is equivalent to 2.2558 mm, which is rounded up to 2.26 mm for ease of calculation. The line, or Parisian line, is an ancient watchmaking measurement that predates metrification and is a direct descendant of the French pied (foot) measurement used under the Ancien Régime. This measurement is generally indicated as a triple apostrophe, so 16 1/2 lines is written as 16 1/2´´´, or 37.22 mm diameter. Here is an explanation about lignes from ETA:įollowing a centuries-old tradition, watchmakers use lines rather than millimetres to describe the size of the movement’s diameter. Interestingly, in addition to watch movements, the lignes unit of measurement is also used by some button and ribbon manufactures. The loi du 19 frimaire an VIII (Law of 10 December 1799) states that one metre is equal to exactly 443.296 French lines. ![]() The ligne or line or Paris line, is a historic unit of length used in France and elsewhere prior to the adoption of the metric system in the late 18th century, and used in various sciences after that time. Although most watch movements will have the diameters listed in millimeter (mm), you may also see linges listed – especially when dealing with raw movements. Lignes is the French word for lines (and pronounced the same way), a unit of measurement for watch movements. What does it all mean? What is a lig-nez?! If you’ve been in the Caliber Corner Community for some time, you’ve seen the word lignes here and there. ![]()
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