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
The metric system is a system of measurement that succeeded the Decimal, decimalised system based on the metre that had been introduced in French Revolution, France in the 1790s. The historical development of these systems culminated in the d ...
in the late 18th century, and used in various sciences after that time. The ''loi du 19 frimaire an VIII'' (Law of 10 December 1799) states that one metre is equal to exactly 443.296 French lines.
It is
vestigial
Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on co ...
ly retained today by
French
French (french: français(e), link=no) may refer to:
* Something of, from, or related to France
** French language, which originated in France, and its various dialects and accents
** French people, a nation and ethnic group identified with Franc ...
and
Swiss
Swiss may refer to:
* the adjectival form of Switzerland
* Swiss people
Places
* Swiss, Missouri
* Swiss, North Carolina
*Swiss, West Virginia
* Swiss, Wisconsin
Other uses
*Swiss-system tournament, in various games and sports
*Swiss Internation ...
watch
A watch is a portable timepiece intended to be carried or worn by a person. It is designed to keep a consistent movement despite the motions caused by the person's activities. A wristwatch is designed to be worn around the wrist, attached by ...
makers to measure the size of watch casings,
in button making and in ribbon manufacture.
Current use
Watchmaking
![BwcOmega911a](https://upload.wikimedia.org/wikipedia/commons/3/33/BwcOmega911a.jpg)
There are 12 ''lignes'' 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
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
, .
One ligne is the equivalent of 0.0888 international
inch
Measuring tape with inches
The inch (symbol: in or ″) is a unit of length in the British imperial and the United States customary systems of measurement. It is equal to yard or of a foot. Derived from the Roman uncia ("twelfth") ...
.
This is comparable in size to the British measurement called "
line
Line most often refers to:
* Line (geometry), object with zero thickness and curvature that stretches to infinity
* Telephone line, a single-user circuit on a telephone communication system
Line, lines, The Line, or LINE may also refer to:
Arts ...
" (one-twelfth of an
English
English usually refers to:
* English language
* English people
English may also refer to:
Peoples, culture, and language
* ''English'', an adjective for something of, from, or related to England
** English national ide ...
inch), used prior to 1824. (The French inch at that time was slightly larger than the English one, but the system of 12 inches to a foot and 12 lines to an inch was the same in both cases.)
Hatmaking
''Ligne'' is used in measuring the width of ribbons in men's hat bands, at 11.26 per international inch.
Button making
The
button trade uses the term ''ligne'' (sometimes "line"), but with a substantially different definition: .
See also
*
*
*
Notes
References
{{reflist
Obsolete units of measurement
Units of length