For the equivalent English unit, see Line (unit). For the Belgian noble house, see Ligne family. For the tributary of the Sambre, see Ligne River.
Not to be confused with the French Line, a shipping company, or The French Line, a 1954 musical.
Ligne
Unit system
French
Unit of
length
Conversions
1 ligne in ...
... is equal to ...
French units
12 Truchet point 1/12pouce
metric (SI) units
2.2558 mm
imperial/US units
0.08881 in
The ligne (pronounced[liɲ] ), or line or Paris line,[1] 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.[2][3] The loi du 19 frimaire an VIII (Law of 10 December 1799) states that one metre is equal to exactly 443.296 French lines.[4]
It is vestigially retained today by French and Swiss watchmakers to measure the size of watch casings,[5][a] in button making and in ribbon manufacture.
^Gates, E.J. (1915). "The Determination of the Limens of Single and Dual Impression by the Method of Constant Stimuli". The American Journal of Psychology. 26 (1): 152–157. doi:10.2307/1412884. JSTOR 1412884.
^Stearn, W.T. (1992). Botanical Latin: History, grammar, syntax, terminology and vocabulary, Fourth edition. David and Charles.
^Neumann, F. (January 1863). "IX. Experiments on the calorific conductibility of solids". Philosophical Magazine. 4. 25 (165): 63–65. doi:10.1080/14786446308643418.
^Suzanne Débarbat. "Fixation de la longueur définitive du mètre" [Establishing the definitive metre] (in French). Ministère de la culture et de la communication (French ministry of culture and communications). Retrieved 2011-03-01.
^ ab"Foire aux questions sur l'horlogerie et les montres" [Frequently asked questions about watches and clocks], horlogerie-suisse.com (in French), retrieved 2022-01-18
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