HOME
The Info List - International Foot


--- Advertisement ---



(i) (i) (i)

The FOOT (pl. FEET; abbreviation: FT; symbol: ′, the prime symbol ) is a unit of length in the imperial and US customary systems of measurement . Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard .

Historically the "foot" was a part of many local systems of units, including the Greek , Roman , Chinese , French , and English systems. It varied in length from country to country, from city to city, and sometimes from trade to trade. Its length was usually between 250 mm and 335 mm and was generally, but not always, subdivided into 12 inches or 16 digits .

The United States is the only industrialized nation that uses the international foot and the survey foot (a customary unit of length ) in preference to the meter in its commercial, engineering, and standards activities. The foot is legally recognized in the United Kingdom; road signs must use imperial units (however distances on road signs are always marked in miles or yards, not feet), while its usage is widespread among the British public as a measurement of height. The foot is recognized as an alternative expression of length in Canada officially defined as a unit derived from the meter although both the U.K. and Canada have partially metricated their units of measurement. The measurement of altitude in international aviation is one of the few areas where the foot is used outside the English-speaking world.

The length of the international foot corresponds to a human foot with shoe size of 13 (UK), 14 (US male), 15.5 (US female) or 46 (EU sizing).

CONTENTS

* 1 Historical origin

* 1.1 England

* 2 Definition

* 2.1 International foot * 2.2 Pre-1959

* 2.3 Survey foot

* 2.3.1 US survey foot * 2.3.2 Indian survey foot

* 3 Historical use

* 3.1 Metric foot

* 3.1.1 France
France
* 3.1.2 Germany

* 3.2 Other obsolete feet

* 4 See also * 5 Notes * 6 References

HISTORICAL ORIGIN

See also: pous Determination of the rod, using the length of the left foot of 16 randomly chosen people coming from church service. Woodcut published in the book Geometrei by Jakob Köbel (Frankfurt, c. 1536).

Historically the human body has been used to provide the basis for units of length. The foot of a white male is typically about 15.3% of his height, giving a person of 160 cm (5 ft 3 in) a foot of 245 mm and one of 180 cm (5 ft 11 in) a foot of 275 mm. These figures are less than the foot used in most cities over time, suggesting that the "foot" was actually a synonym for a "shoe".

Archeologists believe that the Egyptians , Ancient Indians and Mesopotamians preferred the cubit while the Romans and the Greeks preferred the foot. Under the Harappan linear measures, Indus cities during the Bronze Age used a foot of 13.2 inches (333.5 mm) and a cubit of 20.8 inches (528.3 mm). The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (12 in).

The Greek foot (πούς, 'POUS\') had a length of  1⁄600 of a stadion , one stadion being about 181.2 m, therefore a foot being at the time about 302 mm. Its exact size varied from city to city and could range as much as between 270 mm and 350 mm, but lengths used for temple construction appear to have been about 295 mm to 325 mm, the former being close to the size of the Roman foot.

The standard Roman foot (pes) was normally about 295.7 mm (97% of today's measurement), but in the provinces, the pes Drusianus (foot of Nero Claudius Drusus
Nero Claudius Drusus
) was used, with a length of about 334 mm. (In reality, this foot predated Drusus.)

Originally both the Greeks and the Romans subdivided the foot into 16 digits , but in later years, the Romans also subdivided the foot into 12 unciae (from which both the English words "inch" and "ounce " are derived).

After the fall of the Roman Empire, some Roman traditions were continued but others fell into disuse. In AD 790 Charlemagne
Charlemagne
attempted to reform the units of measure in his domains. His units of length were based on the toise and in particular the toise de l'Écritoire, the distance between the fingertips of the outstretched arms of a man. The toise has 6 pieds (feet) each of 326.6 mm (12.86 in).

He was unsuccessful in introducing a standard unit of length throughout his realm: an analysis of the measurements of Charlieu Abbey shows that during the 9th century the Roman foot of 296.1 mm was used; when it was rebuilt in the 10th century, a foot of about 320 mm was used. At the same time, monastic buildings used the Carolingian foot of 340 mm.

The procedure for verification of the foot as described in the 16th century by Jacob Koebel in his book Geometrei. Von künstlichem Feldmessen und absehen is:

Stand at the door of a church on a Sunday and bid 16 men to stop, tall ones and small ones, as they happen to pass out when the service is finished; then make them put their left feet one behind the other, and the length thus obtained shall be a right and lawful rood to measure and survey the land with, and the 16th part of it shall be the right and lawful foot.

ENGLAND

The unofficial public imperial measurement standards erected at the Royal Observatory in Greenwich in the 19th century See also: yard

The measures of Iron Age Britain
Iron Age Britain
are uncertain and proposed reconstructions such as the Megalithic Yard
Yard
are controversial. Later Welsh legend credited Dyfnwal Moelmud with the establishment of their units , including a foot of 9 inches. The Belgic or North German foot of 335 mm (13.2 inches) was introduced to England either by the Belgic Celts during their invasions prior to the Romans or by the Anglo-Saxons
Anglo-Saxons
in the 5th text-transform: lowercase;">AD 43. The Roman foot had been previously standardized by Agrippa at around 296 mm or 11.65 inches. Following the Roman withdrawal and Saxon invasions , the Roman foot continued to be used in the construction crafts while the Belgic foot was used for land measurement. Both the Welsh and Belgic feet seem to have been based on multiples of the barleycorn , but by as early as 950 the English kings seem to have (ineffectually) ordered measures to be based upon an iron yardstick at Winchester
Winchester
and then London
London
. Henry I was said to have ordered a new standard to be based upon his own arm and, by the c. 1300 Act concerning the Composition of Yards and Perches traditionally credited to Edward I or II , the statute foot was a different measure exactly  10⁄11 of the old foot. The barleycorn , inch , ell , and yard were likewise shrunk, while rods and furlongs remained the same. The ambiguity over the state of the mile was resolved by the 1593 Act against Converting of Great Houses into Several Tenements and for Restraint of Inmates and Inclosures in and near about the City of London
London
and Westminster , which codified the statute mile as comprising 5,280 feet. The differences among the various physical standard yards around the world, revealed by increasingly powerful microscopes , eventually led to the 1959 adoption of the international foot defined in terms of the meter.

DEFINITION

INTERNATIONAL FOOT

The international yard and pound agreement of July 1959 defined the length of the international yard in the United States and countries of the Commonwealth of Nations
Commonwealth of Nations
as exactly 0.9144 meters . Consequently, the international foot is defined to be equal to exactly 0.3048 meters. This was 2 ppm shorter than the previous U.S. definition and 1.7 ppm longer than the previous British definition.

The international standard symbol for a foot is "ft" (see ISO 31-1 , Annex A). In some cases, the foot is denoted by a prime , which is often marked by an apostrophe , and the inch by a double prime; for example, 2 feet 4 inches is sometimes denoted as 2′−4″, 2′ 4″ or 2′4″. (See 'minute ' for another case where prime and double prime symbols are used to denote first and second cuts in refining measurement.)

PRE-1959

In the United States, the foot was defined as 12 inches, with the inch being defined by the Mendenhall Order of 1893 by 39.37 inches = 1 m. In Imperial units
Imperial units
, the foot was defined as  1⁄3 yard, with the yard being realized as a physical standard (separate from the standard meter).

The yard standards of the different Commonwealth
Commonwealth
countries were periodically compared with one another. The value of the United Kingdom primary standard of the yard was determined in terms of the meter by the National Physical Laboratory in 1964 as 6999914396900000000♠0.9143969 m, implying a pre-1959 foot in the UK of approximately 6999304798966667000♠0.304798966667 m.

SURVEY FOOT

When the international foot was defined in 1959, a great deal of survey data was already available based on the former definitions, especially in the United States and in India
India
. The small difference between the survey and the international foot would not be detectable on a survey of a small parcel, but becomes significant for mapping, or when the state plane coordinate system (SPCS) is used in the US, because the origin of the system may be hundreds of thousands of feet (hundreds of miles) from the point of interest. Hence the previous definitions continued to be used for surveying in the United States and India
India
for many years, and are denoted SURVEY FEET to distinguish them from the international foot. The United Kingdom was unaffected by this problem, as the retriangulation of Great Britain (1936–62) had been done in meters.

US Survey Foot

The United States survey foot is defined as exactly  1200⁄3937 meters, approximately 6999304800609601000♠0.304800609601 m. Out of the 50 states, 24 have legislated that surveying measures should be based on the U.S. survey foot, eight have legislated that they be made on the basis of the international foot, and 18 have not specified the conversion factor from metric units.

In 1986 the National Geodetic Survey (NGS) released the North American Datum of 1983, which underlies the state plane coordinate systems and is entirely defined in meters. An NGS policy from 1991 has this to say about the units used with the new datum to define the SPCS 83:

In preparation for the adjustment of the North American Datum
North American Datum
of 1983, 31 states enacted legislation for the State Plane Coordinate System of 1983 (SPCS 83). All states defined SPCS 83 with metric parameters. Within the legislation, the U.S. Survey Foot was specified in 11 states and the International Foot was specified in 6 states. In all other states the meter is the only referenced unit of measure in the SPCS 83 legislation. The remaining 19 states do not yet have any legislation concerning SPCS 83.

Since then, 42 states have abandoned the non-metric versions of SPCS 83: seven states continue to keep location data in survey feet as well as in meters, while one state keeps data in international feet as well as in meters. State legislation is also important for determining the conversion factor to be used for everyday land surveying and real estate transactions, although the difference (2 ppm ) is of no practical significance given the precision of normal surveying measurements over short distances (usually much less than a mile).

Indian Survey Foot

The Indian survey foot is defined as exactly 6999304799600000000♠0.3047996 m, presumably derived from a measurement of the previous Indian standard of the yard. The current National Topographic Database of the Survey of India
India
is based on the metric WGS-84 datum , which is also used by the Global Positioning System .

HISTORICAL USE

Page from Austrian Lehrbuch des gesammten Rechnens für die vierte Classe der Hauptschulen in den k.k. Staaten – 1848

METRIC FOOT

An ISO 2848 measure of 3 basic modules (30 cm) is called a "metric foot ", but there were earlier distinct definitions of a metric foot during metrication in France
France
and Germany.

France

In 1799 the meter became the official unit of length in France
France
. This was not fully enforced, and in 1812 Napoleon introduced the system of mesures usuelles which restored the traditional French measurements in the retail trade, but redefined them in terms of metric units. The foot, or pied métrique, was defined as one third of a meter. This unit continued in use until 1837.

Germany

In southwestern Germany in 1806, the Confederation of the Rhine
Confederation of the Rhine
was founded and three different reformed feet were defined, all of which were based on the metric system:

* In Hesse
Hesse
, the Fuß (foot) was redefined as 25 cm. * In Baden
Baden
, the Fuß was redefined as 30 cm. * In the Palatinate , the Fuß was redefined as being  33 1⁄3 cm (as in France).

OTHER OBSOLETE FEET

Prior to the introduction of the metric system, many European cities and countries used the foot, but it varied considerably in length: the voet in Ieper
Ieper
, Belgium, was 273.8 millimetres (10.78 in) while the piede in Venice
Venice
was 347.73 millimetres (13.690 in). Lists of conversion factors between the various units of measure were given in many European reference works including:

* Traité, Paris
Paris
– 1769 * Palaiseau – Bordeaux
Bordeaux
: 1816 * de Gelder, Amsterdam
Amsterdam
and The Hague
The Hague
– 1824 * Horace, Brussels
Brussels
– 1840 * Noback white-space:nowrap;"> in Belgium which had the smallest foot measurements, grouped both units together, while J.F.G. Palaiseau devoted three chapters to units of length: one for linear measures (palms and feet), one for cloth measures (ells) and one for distances traveled (miles and leagues). In the table below, arbitrary cut-off points of 270 mm and 350 mm have been chosen.

LOCATION MODERN COUNTRY LOCAL NAME Metric equivalent (mm) COMMENTS

Vienna
Vienna
Austria Wiener Fuß 316.102

Tyrol Austria Fuß 334.12

Ieper/ Ypres
Ypres
Belgium voet 273.8

Bruges/Brugge Belgium voet 274.3

Brussels
Brussels
Belgium voet 275.75

Hainaut Belgium pied 293.39

Liège Belgium pied 294.70

Kortrijk
Kortrijk
Belgium voet 297.6

Aalst Belgium voet 277.2

Mechelen
Mechelen
Belgium voet 278.0

Leuven
Leuven
Belgium voet 285.5

Tournai
Tournai
Belgium pied 297.77

Antwerp
Antwerp
Belgium voet 286.8

China
China
China tradesman's foot 338.3

China China mathematician's foot 333.2

China China builder's foot 322.8

China China surveyor's foot 319.5

Moravia
Moravia
Czech Republic stopa 295.95

Prague
Prague
Czech Republic stopa 296.4 (1851) Bohemian foot or shoe

301.7 (1759) Quoted as "11 pouces  1 3⁄4 lignes"

Denmark
Denmark
Denmark Fod 313.85 Until 1835, thereafter the Prussian foot

330.5 (1759) Quoted as " 2 1⁄2 lignes larger than the pied "

France
France
France pied du roi 324.84

Angoulême
Angoulême
France pied d'Angoulême 347.008

Bordeaux
Bordeaux
(urban) France pied de ville de Bordeaux 343.606

Bordeaux
Bordeaux
(rural) France pied de terre de Bordeaux 357.214

Strasbourg
Strasbourg
France pied de Strasbourg 294.95

Württemberg
Württemberg
Germany Fuß 286.49

Hanover
Hanover
Germany Fuß 292.10

Augsburg
Augsburg
Germany Römischer Fuß 296.17

Nuremberg
Nuremberg
Germany Fuß 303.75

Meiningen
Meiningen
- Hildburghausen
Hildburghausen
Germany Fuß 303.95

Oldenburg
Oldenburg
Germany Römischer Fuß 296.41

Weimar
Weimar
Germany Fuß 281.98

Lübeck
Lübeck
Germany Fuß 287.62

Aschaffenburg
Aschaffenburg
Germany Fuß 287.5

Darmstadt
Darmstadt
Germany Fuß 287.6 Until 1818, thereafter the Hessen "metric foot"

Bremen
Bremen
Germany Fuß 289.35

Rhineland
Rhineland
Germany Fuß 313.7

Berlin
Berlin
Germany Fuß 309.6

Hamburg
Hamburg
Germany Fuß 286.8

Bavaria
Bavaria
Germany Fuß 291.86

Aachen
Aachen
Germany Fuß 282.1

Leipzig
Leipzig
Germany Fuß 282.67

Dresden
Dresden
Germany Fuß 283.11

Saxony
Saxony
Germany Fuß 283.19

Prussia
Prussia
Germany, Poland, Russia etc. Rheinfuß 313.85

Frankfurt am Main
Frankfurt am Main
Germany Fuß 284.61

Venice
Venice
redefined as 1.033 English feet in 1859.

Burgos
Burgos
and Castile Spain Pie de Burgos/ Castellano 278.6 (1759) Quoted as "122.43 lignes"

Toledo Spain Pie 279.0 (1759) Quoted as "10 pouces 3.7 lignes"

Sweden
Sweden
Sweden fot 296.9 = 12 tum (inches). The Swedish fot was also used in Finland ("jalka").

Zürich
Zürich
Switzerland

300.0

Galicia Ukraine, Poland stopa galicyjska 296.96 Part of Austria before World War I

Scotland
Scotland
United Kingdom fuit, fit, troigh 305.287

(In Belgium, the words pied (French) and voet (Dutch) would have been used interchangeably.)

NOTES

* ^ A B C D The source document used pre-metric French units (pied, pouce and lignes) * ^ The original meter was computed using pre-metric French Units * ^ The Norwegian fot was defined in 1824 as the length of a (theoretical) pendulum that would have a period of  12⁄38 seconds at 45° from the equator * ^ Prior to 1835, the pé or foot was not used in Portugal – instead a palm was used. In 1835 the size of the palm was increased from 217.37 mm (according to Palaiseau) to 220 mm * ^ The Scots foot ceased to be legal after the Act of Union in 1707

SEE ALSO

* Anthropic units * English units
English units
* Mermin\'s foot * Metric foot * History of measurement * Imperial units
Imperial units
* International System of Units
International System of Units
* Pous * Systems of measurement
Systems of measurement
* United States customary units * Units of measurement
Units of measurement

NOTES

* ^ A B The original reference was given in a round number of centimeters

REFERENCES

* ^ "Appendix G – Weights and Measures". The World Factbook. Washington: Central Intelligence Agency
Central Intelligence Agency
. January 17, 2007. Retrieved February 4, 2007. * ^ Kelly, Jon (21 December 2011). "Will British people ever think in metric?". BBC. * ^ Alder, Ken (2002). The Measure of all Things—The Seven-Year-Odyssey that Transformed the World. London: Abacus. * ^ Weights and Measures Act, accessed January 2012, Act current to 2012-01-18. Basis for units of measurement 4.(1) All units of measurement used in Canada shall be determined on the basis of the International System of Units
International System of Units
established by the General Conference of Weights and Measures. (...) Canadian units (5) The Canadian units of measurement are as set out and defined in Schedule II, and the symbols and abbreviations therefore are as added pursuant to subparagraph 6(1)(b)(ii). * ^ Weights and Measures Act * ^ Oswald Ashton Wentworth Dilke (May 22, 1987). Mathematics and measurement. University of California Press. p. 23. ISBN 978-0-520-06072-2 . Retrieved February 2, 2012. * ^ Fessler, Daniel M; Haley, Kevin J; Lal, Roshni D (January–February 2005). "Sexual dimorphism in foot length proportionate to stature" (PDF). Annals of Human Biology. 32 (1): 44–59. doi :10.1080/03014460400027581 . * ^ Kenoyer JM (2010) "Measuring the Harappan world," in Morley I "Archived copy" (PDF). Archived from the original (PDF) on June 26, 2015. Retrieved January 11, 2015. * ^ History of Herodotus : a new English version, book II, 6.7 * ^ http://www.perseus.tufts.edu/hopper/artifact?name=Epidauros%2C+Stadium&object=Building * ^ Oswald Ashton Wentworth Dilke (May 22, 1987). Mathematics and measurement. University of California Press. p. 26. ISBN 978-0-520-06072-2 . Retrieved February 2, 2012. * ^ Russ Rowlett. "How Many? A Dictionary of Units of Measurement". Center for Mathematics and Science Education, University of North Carolina at Chapel Hill . Retrieved February 28, 2011. * ^ Sutherland, Elizabeth R (May 1957). "Feet and dates at Charlieu". Journal of the Society of Architectural Historians. 16 (2). JSTOR
JSTOR
987740 . * ^ Jacob Koebel (16th century). Geometrei. Von künstlichem Feldmessen und absehen (in German). Check date values in: date= (help ) * ^ Great Britain (1762). The statutes at large: from the Magna Charta, to the end of the eleventh Parliament of Great Britain, anno 1761 (continued to 1807). The statutes at large. 1. Printed by J. Bentham. p. 400. Retrieved November 30, 2011. * ^ Zupko, Ronald Edward (1977). British Weights and Measures: A History from Antiquity to the Seventeenth Century. University of Wisconsin Press. pp. 6, 10, 20. ISBN 978-0-299-07340-4 . * ^ "On what basis is one inch exactly equal to 25.4 mm? Has the imperial inch been adjusted to give this exact fit and if so when?". National Physical Laboratory . Retrieved July 24, 2012. * ^ See, for example, Report on the Comparisons of the Parliamentary Copies of the Imperial Standards with the Imperial Standard Yard
Yard
and the Imperial Standard Pound and with each other during the Years 1947 to 1948 (H.M.S.O., London, 1950). Report on the Comparisons of the Parliamentary Copies of the Imperial Standards with each other during the Year 1957 (H.M.S.O., London, 1958). * ^ Bigg, P. H.; Anderton, Pamela (March 1964), "The United Kingdom standards of the yard in terms of the meter", British Journal of Applied Physics, 15 (3): 291–300, Bibcode :1964BJAP...15..291B, doi :10.1088/0508-3443/15/3/308 CS1 maint: Uses authors parameter (link ) * ^ A. V. Astin & H. Arnold Karo, (1959), Refinement of values for the yard and the pound, Washington DC: National Bureau of Standards, republished on National Geodetic Survey web site and the Federal Register (Doc. 59-5442, Filed, June 30, 1959, 8:45 am) * ^ A B National Geodetic Survey (n.d.), "What are the "official" conversions that are used by NGS to convert 1) meters to inches, and 2) meters to feet?", Frequently Asked Questions about the National Geodetic Survey, retrieved May 16, 2009 * ^ National Geodetic Survey (January 1991), Policy of the National Geodetic Survey Concerning Units of Measure for the State Plane Coordinate System of 1983. * ^ Schedule to the Standards of Weights and Measures Act, 1976. * ^ Survey of India
India
, "National Map Policy – 2005" Archived March 31, 2010, at the Wayback Machine
Wayback Machine
.. * ^ Dr. Franz Mozhnik: Lehrbuch des gesammten Rechnens für die vierte Classe der Hauptschulen in den k.k. Staaten. Im Verlage der k.k. Schulbücher Verschleiß-Administration bey St. Anna in der Johannisgasse – Wien 1848 * ^ Denis Février. "Un historique du mètre" (in French). Ministère de l'Économie, des Finances et de l'Industrie. Retrieved March 10, 2011. * ^ A B C D E F G H I J K L M "Amtliche Maßeinheiten in Europa 1842" (in German). Retrieved September 22, 2012. * ^ A B C D E d'Anville, Jean Baptiste Bourguignon (1769). Traité des mesures itinéraires anciennes et modernes (in French). Paris: de l'Imprimerie Royale. Retrieved October 24, 2011. * ^ Palaiseau, JFG (October 1816). Métrologie universelle, ancienne et moderne: ou rapport des poids et mesures des empires, royaumes, duchés et principautés des quatre parties du monde. Bordeaux. Retrieved October 30, 2011. * ^ A B C D E F G H Jacob de Gelder (1824). Allereerste Gronden der Cijferkunst (in Dutch). 's-Gravenhage (The Hague) and Amsterdam: de Gebroeders van Cleef. pp. 163–176. Retrieved March 2, 2011. * ^ A B C D E F G H I Doursther, Horace (1840). Dictionnaire universel des poids et mesures anciens et modernes. Brussels: M. Hayez. pp. 402–418. Retrieved October 25, 2011. * ^ A B C D E Noback, Christian; Noback, Friedrich Eduard (1851). Vollständiges tasehenbuch der Münz-, Maass- und Gewichts-Verhältnisse etc. aller Länder und Handelsplätze (in German). I. Leipzig: F. А. Brockhaus. Retrieved October 24, 2011. * ^ A B Noback, Christian; Noback, Friedrich Eduard (1851). Vollständiges tasehenbuch der Münz-, Maass- und Gewichts-Verhältnisse etc. aller Länder und Handelsplätze (in German). II. Leipzig: F. А. Brockhaus. Retrieved October 24, 2011. * ^ A B C D E F G H Bruhns, Carl (1881). new manual of logarithms to seven places of decimals. Leipzig: Bernhard Tauchnitz. p. 610. Retrieved October 26, 2011. * ^ Thomas Jefferson
Thomas Jefferson
(July 13, 1790). "Plan for Establishing Uniformity in the Coinage, Weights, and Measures of the United States". United States House of Representatives
United States House of Representatives
. Retrieved November 8, 2011. * ^ Jacob de Gelder (1824). Allereerste Gronden der Cijferkunst (in Dutch). The Hague
The Hague
and Amsterdam: de Gebroeders van Cleef. pp. 155–157. Retrieved March 2, 2011. * ^ Andreas Dreizler; et al. (April 20, 2009). "Metrologie" (PDF) (in German). Technische Universität Darmstadt. Retrieved March 28, 2011. * ^ File