Ligne
From Wikipedia, the free encyclopedia
| International units | |
|---|---|
| 2.256×10−3 m | 2.256×10−6 km |
| 2.256 mm | 22.558×106 Å |
| 15.079×10−15 AU | 238.441×10−21 ly |
| US customary / Imperial units | |
| 88.812×10−3 in | 7.401×10−3 ft |
| 2.467×10−3 yd | 1.402×10−6 mi |
- For the French river of the same name see Ligne River.
Ligne is a French word meaning line. It was in use prior to the French adaptation of the metric system in the late 1700s, and is still used by French and Swiss wristwatch makers to measure the size of a watch movement. (For example, Girard-Perregaux will introduced a new 12 ligne chronograph movement.) In this usage there are 12 ligne to one French inch (pouce). The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), and it is abbreviated with the letter L or represented by the triple prime, ′′′.
This is comparable in size to the British measurement called "line," but which is based on the Imperial inch, again being one twelfth of it.
In the eighteenth century the term ligne came into use among German button makers, where is was used to measure the diameter of buttons. The consensus definition was that a ligne was the measurement of a round wick, folded flat. In this sense it measures 1/40th of an inch, but not exactly, for there were several inches in the kingdoms and petty states of Germany at that time. Such a measurement became the American measurement called "line", being one fortieth of the US-customary inch. Its use was again to measure buttons, and was probably introduced by German immigrants.
