Line (unit)

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‴

The line (also línea or linia ) is an old measure of length in precision engineering , namely 1 ⁄ 10 or 1 ⁄ 12 of the underlying inch . The older duodecimal system with 1 ⁄ 12 inches or 1 ⁄ 144 feet was later replaced by the decimal. The line could be (duo) divided decimally into the smaller unit, the point ; were like that

Since the feet or inches were different from region to region, the line also had different values. Examples are:

  • 1 Parisian line = 2.2558 mm
  • 1 Bavarian line = 2.0268 mm
  • 1 Rhineland line = 2.18 mm
  • 1 Spanish line / línea = 1.9 mm
  • 1 Polish line / linia = 2.0mm
  • 1 Vienna line = 2.195 mm
  • 1 Vienna line = 49/50 Paris lines = 0.00224 meters

The Paris line (abbreviated ‴) established itself as a reference dimension denoted by a dash (=  1 ⁄ 10  inch) as well as a millimeter .

The Paris line that is present on various measuring devices , some of which are still in use, is still important today. On the basis of this measure, for example, the pars values ​​were classified on the glass body of the dragonflies until around 1950 . Newer dragonflies, however, are engraved in units of exactly 2 mm.

The common firearm caliber 7.62 mm, which is still used worldwide today , was introduced around 1900 with the so-called three - line rifle .

Line in watchmaking

In watch technology , the Parisian line, also known as ligne , was used as a measure of the caliber (movement diameter). One line corresponds to 2.256 mm. This designation was introduced by the Swiss pocket watch factories, which sold their products all over the world and designated the sizes of the movements in "lines" (lignes). Originally the sizes were given in "Parisian inches" (pouces). This unit soon turned out to be too big because you had to work with fractions all the time. It was therefore replaced by the "line". The “Paris line” was also used as a measure of length by goldsmiths , jewelers and opticians in many countries.

Examples:

  • The designation: caliber 10 1 ⁄ 2 ‴ means a movement diameter of 10.5 lignes (23.69 mm)
  • Old French or Swiss pocket watches often contain information such as: 15 r – 19–28 . This is coded information for: 15 stones , movement diameter 19 lines (42.86 mm), movement height 28 douzièmes (5.26 mm).

See also

literature

  • Steffen Röhner: Military pocket watches. Non-metric dimensions in watchmaking . Callwey, Munich 1992, ISBN 3-7667-1048-6 .

Web links

Individual evidence

  1. ^ A b Johann Friedrich Krüger : Complete handbook of coins, dimensions and weights of all countries in the world ... , Verlag Gottfried Basse, Quedlinburg / Leipzig 1830, p. 158.
  2. ↑ a b panel 1 in the Prussian land register order VIII of October 25, 1881: 1 pr. (Rhine) foot = 144 lines = 139.13 Parisian lines; 1 meter = 443,296 Paris lines.
  3. ↑ Journal of the Royal Bavarian Statistical Bureau, first year 1869, p. 140: Official compilation of the ratios for the conversion of the measurements and weights that have been applicable in Bavaria in this part of the Rhine into those stipulated by the law of April 29, 1869 regarding the Maas and weight system, established new weights and measures.
  4. ^ Johann Friedrich Krüger : Complete manual of the coins, measures and weights of all countries in the world. Published by Gottfried Basse, Quedlinburg and Leipzig 1830, p. 150.
  5. ^ Löbell's annual reports on army and warfare, Volume 27, p. 895
  6. ^ Meyers Large Conversation Lexicon ; 1905 - Ligne Zeno
  7. ^ Brockhaus Kleines Konversations-Lexikon Fifth edition from 1911 - Zeno line
  8. ↑ Lukas Stolberg: Lexicon of the pocket watch ; Carinthia Verlag; Klagenfurt 1995; ISBN 3-85378-423-2 ; P. 127
  9. ↑ German watchmaker's calendar 1926, p. 132 f