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cubit

  (kyū'bĭt) pronunciation
n.

An ancient unit of linear measure, originally equal to the length of the forearm from the tip of the middle finger to the elbow, or about 17 to 22 inches (43 to 56 centimeters).

[Middle English cubite, from Latin cubitum, cubit, elbow.]


 
 

length A very ancient unit, equated with the length of the human forearm from elbow to outstretched finger-tips, and the most versatile body measure. While very variable between persons, for one person it is consistently close to a quarter of the fathom, i.e. the reach finger-tip to finger-tip of outstretched arms, and close to two foot lengths. However, in most formal systems it has been equated with 1½ feet.
[Glazebrook R. T. Nature Vol. 128, 17-28 (1931)] The common cubit contained 24 digits, but the Royal cubit four extra. See also ell.

The Great Pyramid of Ghiza was measured in the 1880s by Flinders Petrie as having sides of length 230.25 to 230.4 m, with a mean of 230.355 m. Postulating them as being 250 cubits points to a cubit of about 461 mm and a fathom of about 1.84 m, i.e. very close to today's international nautical mile, the length of 1 minute of latitude. In turn this indicates that the Ancient Egyptians, nearly 5 000 years ago, measured Earth's radius.

 

A linear unit of measurement used by the ancients; in ancient Egypt, equal to 20.62 in. (52.4 cm).


 
Games:

Cubit!

  • Platform: Amstrad CPC
  • Release Date: 1984
 
Wikipedia: cubit
For the unit of information, see qubit. For the bone, see ulna.
This derivation of the Vitruvian Man by Leonardo da Vinci, depicts nine historical units of measurement: the Yard, the Span, the Cubit, the Flemish Ell, the English Ell, the French Ell, the Fathom, the Hand , and the Foot.  The Vitruvian man was drawn to scale, so the units depicted are displayed with their proper historical ratios.
Enlarge
This derivation of the Vitruvian Man by Leonardo da Vinci, depicts nine historical units of measurement: the Yard, the Span, the Cubit, the Flemish Ell, the English Ell, the French Ell, the Fathom, the Hand , and the Foot. The Vitruvian man was drawn to scale, so the units depicted are displayed with their proper historical ratios.

Cubit is the name for any one of many units of measure used by various ancient peoples and is among the first recorded units of length.

The cubit is based on measuring by comparing – especially cords and textiles, but also for timbers and stones – to one's forearm length. The Egyptian hieroglyph for the unit shows this symbol. It was employed consistently through Antiquity, the Middle-Ages up to the Early Modern Times.

The distance between thumb and another finger to the elbow on an average person and measures about 24 digits or 6 palms or 1½ foot. This is about 45 cm or 18 inches. This so-called "natural cubit" of 1½ foot is used in the Roman system of measures and in different Greek systems.

Over time, units similar in type to the cubit have measured:

  • 6 palms  =  24 digits, i.e. ~45.0 cm or 18 inches (1.50 ft)
  • 7 palms  =  28 digits, i.e. ~52.5 cm or 21 inches (1.75 ft)
  • 8 palms  =  32 digits, i.e. ~60.0 cm or 24 inches (2.00 ft)
  • 9 palms  =  36 digits, i.e. ~67.5 cm or 27 inches (2.25 ft)

From late Antiquity, the Roman ulna, a four-feet-cubit (about 120 cm) is also attested. This length is the measure from a man's hip to the fingers of the outstretched opposite arm.

The English yard could be considered to be a type of cubit, measuring 12 palms, ~90 cm, or 36 inches (3.00 ft). This is the measure from the middle of a man's body to his fingers, always with outstretched arm. The English ell is essentially a kind of great cubit of 15 palms, 114 cm, or 45 inches (3.75 ft).


History of the different cubits

The Egyptian Royal Cubit and Sumerian Nippur cubit

From the Nippur ell to the old royal cubit
Enlarge
From the Nippur ell to the old royal cubit

The cubit is among the first recorded units of length used by an ancient people.

The earliest attested standard measure was called the Royal Cubit and was 523.5 to 524 mm (20.61 to 20.63 inches) in length, and was subdivided into 7 palms of 4 digits, giving a 28 part measure in total. Secure evidence for this unit is known from architecture, from at least as early as the construction of the Step Pyramid of Djoser from around 2,700 B.C.

This unit was used virtually unchanged throughout the Egyptian dynastic period, and is evidenced into the 1st millennium B.C.

In 1916, during the last years of Ottoman Empire and in the middle of WWI the German assyriologist Eckhard Unger found a copper-alloy bar during excavation at Nippur from c. 2650 BC. which he claimed was a measurement standard. This irregularly formed and irregularly marked graduated rule supposedly defined the Sumerian cubit as about 518.5 mm or 20.4 inches, although this does not agree with more secure evidence from the statues of Guduea from the same region. A 30-digit-cubit known a a kus was nevertheless known from the 2nd millennium B.C., with a digit-length of about 17.28 mm (more than 0.68 inch).

Old Egyptian geometers could calculate the square root of two from the value of the hypotenuse of a Cubit. This well-attested old Egyptian unit was known as the "construction remen" and used a good approximation: 2×20/28 root 2.

Other important cubits

  • The Roman cubitus is a six-palms-cubit of about 444.5 mm. Twenty-four Roman cubits equal thirty-five English feet, so the Roman cubit is defined to be 17.5 inches or 444.5 mm.
  • The Greek pechua (πεχυα) was also a 24-digit-cubit. So, the Greek Kyrenaika Cubit measured about 463.1 mm and the Greek Metrios Cubit about 474.2 mm; respectively 25/24 and 16/15 Roman cubits. Other Greek cubits based on different digit measures of other city-states are less important. The Greek 40-digit-measure, called bema, corresponds to the Latin gradus, the step or half-a-pace.
  • The Arabic Hashimi Cubit of about 650.2 mm (25.6 inches) is considered to measure two French feet. Since the established ratio between the French and English foot is 16 to 15 (the small error of about 0.086 % is owed to imperfect standards, not-adjusted mutually), one can give following equation:  5 Hashimi cubits = 10 French feet = 128 English inches. Also the length of 256 Roman cubits and the length of 175 Hashimi cubits are equivalent.
  • The Guard Cubit (Arabic: ammatu rabitu) measured about 555.6 mm; 5/4 of the Roman cubit. Therefore:  96 Guard cubits equal 120 Roman cubits equal 175 English feet.
  • The Arabic Nil Cubit (or Black Cubit) measured about 540.2 mm. This means 28 (later called) Greek digits of the "Pous of Kyrenaika" equal to 25/24 of a Roman foot or just 308.7 mm. Thus 175 Roman Cubits equal 144 Black Cubits.
  • The Mesopotamian cubit measured about 533.4 mm, 6/5 Roman cubit. Thus, 20 Mesopotamian cubits equal 24 Roman cubits equal 35 English feet.
  • The Babylonian cubit (or cubit of Lagash) measured about 496.1 mm. Also a Babylonian trade cubit existed, nine tenth of the normal cubit, i.e. 446.5 mm. The Babylonian Cubit is fifteen sixteenths of the Royal cubit. 160 Babylonian trade cubits equal 144 Babylonian cubits equal 135 Egyptian Royal cubits. (The Royal cubit is equal to 529.2 mm. See above).
  • The Pergamon cubit 520.9 mm or 75/64 of the Roman cubit.
  • The Salamis cubit 484.0 mm or 98/90 of the Roman cubit.
  • The Persian cubit of about 500.1 mm or 9/8 of the Roman cubit, which is also 9/10 of the Guard cubit.
  • In Izapa, a Precolumbian Mesoamerican city, the measuring unit was equivalent to about 495 mm, very close to the Lagash cubit. This is probably a coincidence, since a diffusion of culture from Mesopotamia to Mesoamerica has not been conclusively demonstrated.
  • The different Jewish cubits (אַמָּה ama) are generally borrowed either from Babylonians or Greeks or Romans. In ancient Israel during the First Temple period, the cubit was 428.1 mm (= 26/27 Roman cubit). During the Second Temple period, a cubit of about 444.5 mm (= Roman cubit) was in general use, but in the sacred areas of the temple a special cubit of 437.6 mm seems to have been used instead (= 63/64 Roman cubit).[1]


See also


References

Notes

  1. ^ Cf. Biblical Archaeology Review, March-April 1983, and Newsletter and Proceedings of the Society for Early Historical Archaeology, issue 159.)

External links


 
Translations: Translations for: Cubit

Dansk (Danish)
n. - gl. længdemål, 18-22 tommer

Nederlands (Dutch)
el (bijbelse maat)

Français (French)
n. - (Hist, Mes) longueur entre 17 et 22 pouces

Deutsch (German)
n. - Elle

Ελληνική (Greek)
n. - (μέτρο μήκους) πήχης, κύβιτον

Italiano (Italian)
cubito

Português (Portuguese)
n. - cúbico (m) (Anat.), côvado (m)

Русский (Russian)
локоть (мера длины)

Español (Spanish)
n. - codo (medida de longitud), cúbito

Svenska (Swedish)
n. - aln (britt. åld.)

中文(简体) (Chinese (Simplified))
腕尺

中文(繁體) (Chinese (Traditional))
n. - 腕尺

한국어 (Korean)
n. - 팔꿈치에서 가운데 손가락까지 길이

日本語 (Japanese)
n. - キュービット, 腕尺

العربيه (Arabic)
‏(الاسم) ذراع (مقياس, )‏

עברית (Hebrew)
n. - ‮אמה (מידת-אורך)‬


 
 

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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more
Measures and Units. A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.  Read more
Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Games. Copyright © 2008 All Media Guide, LLC. Content provided by All Game Guide ® , a trademark of All Media Guide, LLC. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cubit" Read more
Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved.  Read more

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