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The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), [4] and it is abbreviated with the letter L or represented by the triple prime, ‴. [5] One ligne is the equivalent of 0.0888 international inch. This is comparable in size to the British measurement called "line" (one-twelfth of an English inch), used prior to ...
The term for telescopes persisted even in the 20th century, with a telescope listed in the 1909 Sears Roebuck catalog of having 25 lignes diameter aperture, or about 56 mm (5.6 cm). [5] The measurement SPI (Stitches per inch) for leather pricking irons and stitch marking wheels also commonly uses the Paris inch instead of the Imperial inch.
The United States retained the 1 / 39.37 -metre definition for surveying, producing a 2 millionth part difference between standard and US survey inches. [47] This is approximately 1 / 8 inch per mile; 12.7 kilometres is exactly 500,000 standard inches and exactly 499,999 survey inches.
[10] [11] [12]: 60–66 The system of Fournier was based on a different French foot of c. 298 mm. With the usual convention that 1 foot equals 12 inches, 1 inch (pouce) was divided into 12 lines (lignes) and 1 line was further divided into 6 typographic points (points typographiques). One Fournier point is about 0.0135 English inches.
0.188 mm 7.401 thou 1 ⁄ 12 of a ligne. This unit is usually called the Truchet point in English. Prior to the French Revolution the Fournier point was also in use. It was 1 ⁄ 6 of a ligne or 1 ⁄ 864 of the smaller French foot. ligne: 1 ⁄ 144: 2.256 mm 88.81 thou 1 ⁄ 12 of a pouce. This corresponds to the line, a traditional English ...
La loi du 4 juillet 1837 (the law of 4 July 1837) of the July Monarchy effectively revoked the use of mesures usuelles by reaffirming the laws of measurement of 1795 and 1799 to be used from 1 May 1840. [1] However, many units of measure, such as the livre, remained in colloquial use for many years and the livre still does to some extent.
One pied (1 fuss) was equal to 0.30 m, according to the fixed value defined during the transition to the metric system. [1] [4] Some other units and their fixed values are given below: 1 ligne = 1/144 pied 1 linie = 1/144 pied 1 pouce = 1/12 pied 1 zoll = 1/12 pied 1 aune = 2 pied (or 4 pied [3]) 1 elle = 2 pied 1 brache = 2 pied [3] 1 toise ...
The toise (fathom) was defined as exactly two metres and was as before divided into 6 pieds (or "feet") or 72 pouces (inches). The pouce was divided into 12 lignes (or "lines"). The pied and pouce, at precisely 333. 3 mm and 27. 7 mm, were about 2.6% larger than the previous Parisian measures and 9% larger than their English counterparts.