Line (unit)

Short description: English unit of length

The line (abbreviated L or l or ‴ or lin.) was a small English unit of length, variously reckoned as ​1⁄10, ​1⁄12, ​1⁄16, or ​1⁄40 of an inch. It was not included among the units authorized as the British Imperial system in 1824.

## Contents

* 1 Size
* 2 In use
* 3 Foreign units
* 4 See also
* 5 References
* 5.1 Citations
* 5.2 Bibliography

## Size

The line was not recognized by any statute of the English Parliament but was usually understood as ​1⁄4 of a barleycorn,[1] which itself was recognized by statute as ​1⁄3 of an inch.[2] The line was eventually decimalized as ​1⁄10 of an inch, without recourse to barleycorns.[5]

The US button trade uses the same or a similar term but defined as one-fortieth of the US-customary inch (making a button-maker's line equal to 0.635 mm).[6][7]

## In use

Botanists formerly used the units (usually as ​1⁄12 inch) to measure the size of plant parts. Linnaeus's Philosophia botanica (1751) includes the Linea in its summary of units of measurements, defining it as "Linea una Mensurae parisinae"; Stearns gives its length as 2.25 mm. Even after metrication, British botanists continued to employ tools with gradations marked as linea (lines); the British line is approx. 2.1 mm and the Paris line approx. 2.3 mm.[8]

Entomologists, both in the UK and in other European countries, in the 1800s were using lines as a unit of measurement for insects, at least for the relatively large mantids and phasmids - examples include Westwood,[9][10] in the UK, and de Haan[11] in the Netherlands.

Gunsmiths and armament companies also employed the ​1⁄10-inch line (the "decimal line"), in part owing to the importance of the German and Russian arms industries.[12] These are now given in terms of millimeters, but the seemingly arbitrary 7.62 mm caliber was originally understood as a 3-line caliber (as with the 1891 Mosin–Nagant rifle). The 12.7 mm caliber used by the M2 Browning machine gun was similarly a 5-line caliber.[12]

## Foreign units

Other similar small units called lines include:

* The Russian liniya (ли́ния), ​1⁄10 of the diuym which had been set precisely equal to an English inch by Peter the Great[13]
* The French ligne or "Paris line", ​1⁄12 of the French inch (French: pouce), 2.256 mm and about 1.06 L.
* The Portuguese linha, ​1⁄12 of the Portuguese inch or 12 "points" (pontos) or 2.29 mm
* The German linie was usually ​1⁄12 of the German inch but sometimes also ​1⁄10 German inch
* The Vienna line, ​1⁄12 of a Vienna inch.[14][15]

## See also

* English units used prior to 1824
* Imperial units defined by the British Weights and Measures Act of 1824
* List of unusual units of measurement

## References

### Citations

1. ↑ (3rd ed.). Oxford University Press. "a former unit of measurement (about a third of an inch) based on the length of a grain of barley".
2. ↑ Fowler, W. (1884). "On the ancient terms applicable to the measurement of land". Transactions. XVI. Royal Institution of Chartered Surveyors. p. 277. https://archive.org/details/transactions04survgoog/page/n295/mode/2up.
3. ↑ Jefferson (1790).
4. ↑ Niles (1814), p. 22.
5. ↑ Jefferson,[3] republished by Niles.[4]
6. ↑ "An Easy Guide to Button Measurement and Sizing". Sun Mei Button Enterprise Co., Ltd.. 2019-06-19. https://www.sunmeibutton.com/button-measurement/.
7. ↑ The Metric System | Hearings Before a Subcommittee of the Committee on Manufactures, United States Senate, Sixty-seventh Congress, First and Second Sessions on S. 2267 a Bill to Fix the Metric System of Weights and Measures as the Single Standard of Weights and Measures for Certain Uses.. By United States. Congress. Senate. Committee on Manufactures. October 11, 1921. p. 216.
8. ↑ Stearn, W.T. (1992). Botanical Latin: History, grammar, syntax, terminology and vocabulary, Fourth edition. David and Charles.
9. ↑ Westwood, J.O. (1859). Catalogue of the Orthopterous Insects in the Collection of British Museum. Part I: Phasmidae.. British Museum, London..
10. ↑ Westwood, J.O. (1889). Revisio Insectorum Familiae Mantidarum, speciebus novis aut minus cognitis descriptis et delineatis. – Revisio Mantidarum.. Gurney & Jackson, London..
11. ↑ Haan, W.de (1842). Bijdragen tot de Kennis Orthoptera. in C.J. Temminck, Verhandelingen over de natuurlijke Geschiedenis der Nederlandsche overzeesche Bezittingen. volume 2..
12. ↑ 12.0 12.1 Hogg (1991).
13. ↑ Cardarelli (2004), pp. 121–124.
14. ↑ Albert Johannsen. "Manual of petrographic methods". p. 623.
15. ↑ Karl Wilhelm Naegeli; Simon Schwendener. "The Microscope in Theory and Practice". p. 294.

### Bibliography

* Cardarelli, F. (2004), Encyclopaedia of Scientific Units, Weights and Measures: Their SI Equivalences and Origins, 2nd ed., Springer, ISBN 1-85233-682-X, https://books.google.com/books?id=6KCx8Ww75VkC .
* Cole, Rory Ely (2002), Common Linear Measure (Years of 732 & 1154), archived from the original on 19 January 2012, https://web.archive.org/web/20120119200632/http://www.weights-and-measures.com/xcomlinear.html .
* Hogg, Ian V. (1991), Military Small Arms of the 20th Century, 6th ed., Guild Publishing .
* Jefferson, Thomas (4 July 1790), Report on the Subject of Measures, Weights, and Coins, New York, https://books.google.com/books?id=fuNGAQAAMAAJ&pg=PA20 .
* Niles, Hezekiah, ed. (1814), "Jefferson on Weights and Measures: Letter from the Secretary of State to the Speaker of the House of Representatives: New-York, July 4, 1790", The Weekly Register, V (Sept. 1813 – Mar. 1814), Baltimore: Franklin Press, pp. 20–26, https://books.google.com/books?id=fuNGAQAAMAAJ&pg=PA22 .

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