The Metre Convention (French: Convention du Mètre), also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations (Argentina, Austria-Hungary, Belgium, Brazil, Denmark, France, Germany, Italy, Peru, Portugal, Russia, Spain, Sweden and Norway, Switzerland, Ottoman Empire, United States of America, and Venezuela). The treaty created the International Bureau of Weights and Measures (BIPM), an intergovernmental organization under the authority of the General Conference on Weights and Measures (CGPM) and the supervision of the International Committee for Weights and Measures (CIPM), that coordinates international metrology and the development of the metric system.
As well as founding the BIPM and laying down the way in which the activities of the BIPM should be financed and managed, the Metre Convention established a permanent organizational structure for member governments to act in common accord on all matters relating to units of measurement.
The three organs of the BIPM are:
- The General Conference on Weights and Measures (Conférence générale des poids et mesures or CGPM) – the plenary organ of the BIPM which consists of the delegates of all the contracting Governments;
- The International Committee for Weights and Measures (Comité international des poids et mesures or CIPM) – the direction and supervision organ of the BIPM that is made of 18 prominent metrologists from 18 different member states;
- The headquarters or secretariat of the BIPM which is located at Saint-Cloud, France. The secretariat employs around 70 people and hosts BIPM's formal meetings.
Only states can be Members as per the Metre Convention. In addition to Member status, the General Conference on Weights and Measures (CGPM) created in 1999 the status of Associate of the CGPM open to States and Economic Entities to enable them to participate in some activities of the BIPM through their National Metrology Institutes (NMIs). Membership of the convention requires payment of substantial fees. Failure to pay these over a span of years, without any expectation of a payment agreement, has caused a number of nations such as North Korea to be removed from the protocol. As of 13 January 2020[update], there are 62 member states and 40 associate states and economies.
Initially the Metre Convention was only concerned with the units of mass and length but, in 1921, at the 6th meeting of the General Conference on Weights and Measures (CGPM), it was revised and it extended the scope and responsibilities of the BIPM to other fields in physics. In 1960, at the 11th meetings of the CGPM, the system of units it had established was named the International System of Units, with the abbreviation SI.
Before the French Revolution, which started in 1789, French units of measurement were based on the Carolingian system, introduced by the first Holy Roman Emperor Charlemagne (800–814 AD) which in turn were based on ancient Roman measures. Charlemagne brought a consistent system of measures across the entire empire. However, after his death, the empire fragmented and many rulers introduced their own variants of the units of measure.
Some of Charlemagne's units of measure, such as the pied du Roi (the king's foot) remained virtually unchanged for about a thousand years, while others, such as the aune (ell—used to measure cloth) and the livre (pound) varied dramatically from locality to locality. By the time of the revolution, the number of units of measure had grown to the extent that it was almost impossible to keep track of them.
In England in 1215, clause 25 of the Magna Carta required that the same standards of measurement be applied throughout the realm. The wording of the clause emphasized that "There is to be a single measure ... throughout our realm". Five centuries later, when in 1707 England and Scotland were united into a single kingdom, the Scots agreed to use the same units of measure that were already established in England. During the eighteenth century, in order to facilitate trade, Peter the Great, Czar of Russia adopted the English system of measure.
From 1668 to 1776 the French standard of length was the Toise of Châtelet which was fixed outside the Grand Châtelet in Paris. In 1735 two geodetic standards were calibrated against the Toise of Châtelet. One of them, the Toise of Peru was used for the Spanish-French Geodesic Mission. In 1766 the Toise of Peru became the official standard of length in France and was renamed Toise of the Academy (French: Toise de l'Académie).
Profusion of units of measures was a practical problem of importance before the French Revolution and its reform was one of the items on the agenda of National Assembly. In 1799, after the remeasurement of the Paris meridian arc (French: Méridienne de France) between Dunkirk and Barcelona by Delambre and Mechain, the metre was defined as a quarter of a 10-millionth of the Earth circumference or 3 pieds (french feet) and 11.296 lignes (lines) of the Toise of the Academy. Talleyrand, an influential leader of the Assembly invited British and American participation in the establishment of a new system, but in the event, the Assembly went it alone and introduced the metre and the kilogram which were to form the basis of the metric system, manufacturing prototypes which, in 1799, were lodged with Archives.
The Helvetic Republic adopted the metric system in 1803. In 1805, a Swiss immigrant Ferdinand Rudolph Hassler brought copies of the French metre and kilogram in the United States. In 1830 the Congress decided to create uniform standards for length and weight in the United States. Hassler was mandated to work out the new standards and proposed to adopt the metric system. The United States Congress opted for the British Parliamentary Standard Yard of 1758 and the British Troy Pound of 1824 as length and weight standards. Nevertheless, the primary baseline of the U.S Coast Survey was measured in 1834 at Fire Island using four two-metre iron bars constructed after Hassler's specification in Great Britain and brought back in the United States in 1815. All distances measured in the U.S. National Geodetic Survey were referred to the metre.
Between 1840 and 1870, a number of countries definitively adopted the metric system as their system of measure including France, Spain, many South American republics and many of the Italian and German states (the Netherlands had adopted the system in 1817). In 1863, the International Postal Union used grams to express permitted weights of letters.
In 1852 the Spanish Government was urged by the Spanish Royal Academy of Sciences to approve the creation of a large-scale map of Spain. The following year Carlos Ibáñez e Ibáñez de Ibero was appointed to undertake this task. All the scientific and technical material had to be created. Carlos Ibáñez e Ibáñez de Ibero and Frutos Saavedra Meneses went to Paris to supervise the production by Brunner of a four metres long measuring instrument which they had devised and which they later compared with Borda's double-toise N°1 which was the main reference for measuring all geodetic bases in France and whose length was 3.8980732 metres.
In 1867 at the second General Conference of the International Association of Geodesy (German: Europäische Gradmessung) held in Berlin, the question of international standard of length was discussed in order to combine the measurements made in different countries to determine the size and shape of the earth. The conference recommended the adoption of the metric system (replacing Bessel's toise, a copy of the Toise of Peru made in 1823) and the creation of an International Metre Commission.
In the 1860s, inspections of the prototype metre revealed wear and tear at the measuring faces of the bar and also that the bar was wont to flex slightly when in use. In view of the doubts being cast on the reproducibility of the metre and the kilogram and the threat that a rival standard might be set up, Napoleon III invited scientists from all the world's nations to attend a conference in Paris. In July 1870, two weeks before the conference was due to start, the Franco-Prussian War broke out. Although the delegates did meet (without a German delegation), it was agreed that the conference should be recalled once all the delegates (including the German delegation) were present. The International Metre Commission was established in Paris.
Following the war, which resulted in Napoleon III's exile, Germany and Italy, now unified nations, adopted the metric system as their national system of units, but with the prototype copy of the kilogram and metre under the control of the Third French Republic. In 1872 the new republican government reissued the invitations and in 1875 scientists from thirty European and American countries met in Paris. This same year, the International Association of Geodesy held its General Conference in Paris and decided the creation of an international geodetic standard for baselines' measurement calibrated against the metre.
The principal tasks facing the delegates at the 1875 conference was the replacement of the existing metre and kilogram artefacts that were held by the French Government and the setting up of an organization to administer the maintenance of standards around the globe. The conference did not concern itself with other units of measure. The conference had undertones of Franco-German political manoeuvring, particularly since the French had been humiliated by the Prussians during the war a few years previously. Although France lost control of the metric system, they ensured that it passed to international rather than German control and that the international headquarters were located in Paris. Spain notably supported France for this outcome and the first president of the International Committee for Weights and Measures, the Spanish geodesist, Carlos Ibáñez e Ibáñez de Ibero received the Grand Officer medal of the Légion d'Honneur for his diplomatic role on this issue and was awarded the Poncelet Prize for his scientific contribution to metrology. Indeed, as Carlos Ibáñez e Ibáñez de Ibero was collaborating with the French on the Paris meridian arc (West Europe-Africa Meridian-arc) remeasurement since 1853, and was president of both the Permanent Committee of the International Metre Commission since 1872 and the Permanent Commission of the International Association of Geodesy since 1874, he was to play a pivotal role in reconciling French and German interests.
The conference was called to discuss the maintenance of international standards based on the existing French standards rather than using French standards which, at that time, were 70 years old and which, through wear and tear, might not be exactly the same as when they adopted in 1799.
Prior to the 1870 conference, French politicians had feared that the world community might reject the existing metre as it was 0.03% (300 µm) shorter than its design length, ordering a new meridional measurement. They were eventually reassured when the German-born Swiss delegate Adolphe Hirsch said "no serious scientist would in our day and age contemplate a metre deduced from the size of the earth". When the conference was reconvened in 1875, it was proposed that new prototype metre and kilogram standards be manufactured to reproduce the values of the existing artifacts as closely as possible.
Although the new standard metre had the same value as the old metre, it had an "X" cross-section rather than a rectangular cross-section as this reduced the flexing when taking measurements. Moreover, the new bar, rather than being exactly one metre in length was a little longer than one metre and had lines engraved on them that were exactly one metre apart. The London firm Johnson Matthey delivered 30 prototype metres and 40 prototype kilograms. At the first meeting of the CGPM in 1889 bar No. 6 and cylinder No. X were chosen by lot as the international prototypes. The remainder were either kept as BIPM working copies or distributed by lot to member states as national prototypes.
The prototype metre was retained as the international standard until 1960 when the metre was redefined in terms of the wavelength of the orange-red line of krypton-86. The current definition of the metre is "the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second".
On 16 November 2018, the 26th General Conference on Weights and Measures (CGPM) voted unanimously in favour of revised definitions of some SI base units, in particular the kilogram. The new definitions came into force on 20 May 2019, but do not change the metre. 
The Convention created an international organization with three organs to facilitate the standardization of weights and measures around the world. The first, the CGPM provides a forum for representative of member states, the second, the CIPM is an advisory committee of metrologists of high standing and the third, is the secretariat that provides appropriate meeting and laboratory facilities in support of the CGPM and CIPM.
General Conference on Weights and Measures
The General Conference on Weights and Measures (Conférence générale des poids et mesures or CGPM) is the principal decision-making body put on place by the convention. It is made up of delegates from member states and [non-voting] observers from associate states and economies. The conference usually meets every four years to receive and discuss a report from the CIPM and to endorse new developments in the SI on the advice of the CIPM though at the 2011 meeting, it agreed to meet again in 2014 rather than 2015 to discuss the maturity of the new SI proposals. It is also responsible for new appointments to the CIPM and decides on major issues concerning the development and financing of the BIPM. According to the Metre Convention (Art. 4) the President of the French Academy of Sciences is also the President of the General Conference on Weights and Measures.
International Committee for Weights and Measures
The International Committee for Weights and Measures (Comité international des poids et mesures or CIPM) is made up of eighteen (originally fourteen) individuals from a member state of high scientific standing, nominated by the CGPM to advise the CGPM on administrative and technical matters. It is responsible for the running of ten consultative committees (CCs), each of which investigates different aspects of metrology – one CC discusses the measurement of temperature, another the measurement of mass and so on. The CIPM meets annually at Saint-Cloud to discuss annual reports from the various CCs, to submit an annual report to the governments of member states in respect of the administration and finances of the BIPM and to advise the CGPM on technical matters as and when necessary. Each member of the CIPM is from a different member state – with France, in recognition of its work in setting up the Convention, always having one seat on the CIPM.
Secretariat of the BIPM
The Secretariat of the International Bureau of Weights and Measures (Bureau international des poids et mesures or BIPM) is based at Saint-Cloud, France. It has custody of the now historical international prototype of the kilogram and provides metrology services for the CGPM and CIPM, and hosts their formal meetings. It also has custody of the former international prototype of the metre which was retired in 1960. Over the years the various prototypes of the metre and of the kilogram were returned to BIPM headquarters for recalibration services.
Initially it had a staff of 9, falling to 4 once the initial batch of prototypes had been distributed; in 2012 it had a staff of over 70 people and an annual budget of over €10 million. The director of the BIPM is ex-officio a member of the CIPM and a member of all consultative committees.
Headquarters, language and protocol
The original treaty was written in French and the authoritative language of all official documents is French. Communication between the BIPM and member states is, in the case of France, via the French Foreign Minister and in the case of all other members, via the members' ambassador to France.
The French government offered the treaty members the Pavillon de Breteuil in Saint-Cloud to house the BIPM. The Pavillon was originally built in 1675 on the estate of the Château de Saint-Cloud and was home to, amongst others, Emperor Napoleon III. The château was all but destroyed during the Franco-Prussian War (1870–1) and the Pavillon badly damaged. The Pavillon has been fully restored and, as headquarters of an intergovernmental organization enjoys privileges and immunities.
Post 1875 developments
The science of metrology has progressed vastly since 1875. In particular the treaty was amended in 1921 with the result that many other international organizations have a forum within the CIPM to ensure harmonization of measurement standards across many disciplines. In addition, what were originally conceived as standards for the purposes of trade have now been extended to cover a large number of aspects of human activity including medicine, science, engineering and technology.
Extensions to the treaty (1921) and development of SI
The metre convention was originally drawn up with the main purpose of providing a standards of length and mass only. Standards relating to other quantities were under the control of other bodies – time was measured by astronomers, electrical units by a series of ad-hoc international conferences, and other physical standards and concepts were maintained or defined by international bodies such as International Congress of Applied Chemistry or the International Union of Pure and Applied Physics.
In 1901 Giorgi published a proposal for building a coherent set of units based on four base units – the metre, kilogram, second and one electrical unit (ampere, volt or ohm). In 1921 the Convention was extended to permit the promotion of standards relating to any physical quantity which greatly increased the scope of the CIPM's remit and implicitly giving it freedom to exploit Giorgi's proposals. The 8th CGPM (1933) resolved to work with other international bodies to agree standards for electrical units that could be related back to the international prototypes. This was agreed in principle by the International Electrotechnical Commission at its congress in Brussels in 1935 subject to the choice of the fourth unit being agreed with, amongst others, the appropriate consultative committee of the CIPM.
In 1948, three years after the end of the Second World War and fifteen years after the 8th CGPM, the 9th CGPM was convened. In response to formal requests made by the International Union of Pure and Applied Physics and by the French Government to establish a practical system of units of measure, the CGPM requested the CIPM to prepare recommendations for a single practical system of units of measurement, suitable for adoption by all countries adhering to the Metre Convention. At the same time the CGPM formally adopted a recommendation for the writing and printing of unit symbols and of numbers. The recommendation also catalogued the recommended symbols for the most important MKS and CGS units of measure and for the first time the CGPM made recommendations concerning derived units.
The CIPM's draft proposal, which was an extensive revision and simplification of the metric unit definitions, symbols and terminology based on the MKS system of units, was put to the 10th CGPM in 1954. In the proposal the CIPM recommended that the ampere be the base unit from which electromechanical standards would be derived. After negotiations with the CIS and IUPAP, two further base units, the degree kelvin and the candela were also proposed as base units. The full system and name "Système International d'Unités" were adopted at the 11th CGPM. During the years that followed the definitions of the base units and particularly the mise en pratique to realize these definitions have been refined.
The formal definition of International System of Units (SI) along with the associated resolutions passed by the CGPM and the CIPM are published by the BIPM on the Internet and in brochure form at regular intervals. The eighth edition of the brochure Le Système International d'Unités – The International System of Units was published in 2006.
During the 1940s, the United States government recognized the benefits of its suppliers keeping quality control records in respect of manufactured goods that would provide traceability of the process. This process was formalized by the British Government and in 1979 as the quality control standard BS 5750. In 1987 BS 5750 was adopted by ISO as the basis for ISO 9000. ISO 9000 is a general purpose quality control standard which works in conjunction industry-specific standards: for example ISO 15195:2003 which gives the specific requirements for reference measurement laboratories in laboratory medicine.
International trade is hampered by one country not recognising the quality controls in place in other countries – often due to standards being different or being incompatible with each other. At the 20th CGPM (1995), it was recognized that although ad-hoc recognition of instrument calibration between cooperating countries had been taking place for a hundred years, a need had arisen for a more comprehensive agreement. Consequently, the CIPM was mandated to investigate the setting up of a Mutual Recognition Agreement in respect of instrument calibration. Any such agreement would require the keeping of records that could demonstrate the traceability of calibrations back to the base standards. Such records would be recorded within an ISO 9000 framework. Four years later, in 1999 the text of the CIPM-MRA was agreed at the 21st CGPM.
The CIPM-MRA scheme is to catalogue the capabilities of National Measurement Institutes (NMIs) such as NIST in the United States or the National Physical Laboratory in Britain whose calibration procedures have been peer-assessed. The essential points of CIPM-MRA are:
- The agreement is only open to countries that have signed the Metre Convention, either as full or as associate members.
- A country may have more than one NMI, though only one NMI is chosen as the signatory organization.
- The measurement capabilities of NMI's will be peer-reviewed at regular intervals and each NMI will recognize the measurement capabilities of other NMIs.
- The BIPM maintains a publicly available database of the measurement capabilities of each NMI.
Subsequent to launch of the CIPM MRA and in response to a European Community directive on in vitro medical devices, the Joint Committee for Traceability in Laboratory Medicine (JCTLM) was created in 2002 through a Declaration of Cooperation between the International Committee of Weights and Measures (CIPM), the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC), and the International Laboratory Accreditation Cooperation (ILAC). The joint committee provides a forum for the harmonization of standards of the various participants.
Coordination of International Atomic Time
With the advent of the atomic clock it has been possible to define and measure International Atomic Time with sufficient precision that variations in the Earth's rotation can be detected. The International Earth Rotation Service monitors these changes relative to the stars at regular intervals and proposes leap seconds as and when these are needed. Currently there are over 200 atomic clocks in over 50 national laboratories around the world and the BIPM, in terms of the mandate given to it under the Metre Convention, coordinates the various atomic clocks.
After 1960, when the definition of the metre was linked to a particular wavelength of light rather than the international prototype of the metre, the only unit of measure that remained dependent on a particular artefact was the kilogram. Over the years, small drifts which could be as high as 20×10−9 kilograms per annum in the mass of the international prototype of the kilogram were detected. At the 21st meeting of the CGPM (1999), national laboratories were urged to investigate ways of breaking the link between the kilogram and a specific artefact.
Independently of this drift having been identified, the Avogadro project and development of the Kibble (or watt) balance promised methods of indirectly measuring mass with a very high precision. These projects provided tools that enabled alternative means of redefining the kilogram.
A report published in 2007 by the Consultative Committee for Thermometry to the CIPM noted that their definition of temperature had proved to be unsatisfactory for temperatures below 20 K and for temperatures above 1300 K. The committee was of the view that the Boltzmann constant provided a better basis for temperature measurement than did the triple point of water, as it overcame these difficulties.
Over the next few years the support for natural constants grew and details were clarified, until in November 2018, the 26th General Conference on Weights and Measures voted unanimously in favour of revised definitions of the SI base units. The 2019 redefinition of the SI base units came into force on the 144th anniversary of the Convention, 20 May 2019. 
The CGPM recognizes two classes of membership – full membership for those states that wish to participate in the activities of the BIPM and associate membership for those countries or economies[Note 1] that only wish to participate in the MRA programme. Associate members have observer status at the CGPM. Since all formal liaison between the convention organizations and national governments is handled by the member state's ambassador to France,[Note 2] it is implicit that member states must have diplomatic relations with France, though during both world wars, nations that were at war with France retained their membership of the CGPM. The opening session of each CGPM is chaired by the French foreign minister and subsequent sessions by the president of the French Academy of Sciences.
On 20 May 1875 representatives from seventeen of countries that attended the Conference of the Metre in 1875, signed the Convention of the Metre.[Note 3] In April 1884 HJ Chaney, Warden of Standards in London unofficially contacted the BIPM inquiring whether the BIPM would calibrate some metre standards that had been manufactured in Britain. Broch, director of the BIPM replied that he was not authorized to perform any such calibrations for non-member states. On 17 September 1884, the British Government signed the convention. This number grew to 21 in 1900, 32 in 1950, and 49 in 2001. As of 13 January 2020[update], the General Conference membership was made up of 62 member states, 40 associate states and economies and four international organizations as follows (with year of partnership between brackets):
|Name||Year of partnership||Notes|
|Austria||1875||Joined originally as Austria-Hungary|
|Belarus||2020||Belarus was previously an Associate member since 2003|
|Czech Republic||1922||Joined originally as part of Czechoslovakia|
|Ecuador||2019||Ecuador was previously an Associate member since 2000|
|Germany||1875||Joined originally as the German Empire|
|Ireland||1925||Joined originally as the Irish Free State|
|Norway||1875||Joined originally as part of Sweden and Norway|
|Russian Federation||1875||Joined originally as the Russian Empire|
|Serbia||1879||Joined as the Principality of Serbia in 1879, as the Kingdom of Yugoslavia in 1929, and as the Federal Republic of Yugoslavia in 2001|
|Slovakia||1922||Joined originally as part of Czechoslovakia|
|Sweden||1875||Joined originally as part of Sweden and Norway|
|Turkey||1875||Joined originally as the Ottoman Empire|
|United Arab Emirates||2015|
|Country||Year of partnership|
|Bosnia and Herzegovina||2011|
|Republic of Moldova||2007|
The following international organizations have signed the CIPM MRA:
- International Atomic Energy Agency (IAEA), Vienna, Austria (1999)
- Institute for Reference Materials and Measurements (IRMM), Geel, Belgium (1999)
- World Meteorological Organization (WMO), Geneva, Switzerland (2010)
- European Space Agency (ESA), Paris, France (2012)
Former member states
The following former members were excluded from the organization following failure to pay their arrears over a span of years and upon failing to provide any form of payment plan:
- Cameroon was a member state from 1970 until 22 October 2012.
- North Korea was a member state from 1982 until 2012
- Dominican Republic was a member state from 1954 until 31 December 2014.
- Venezuela was a member state from 1879 until 14 November 2018.
- Yemen was an associate from 21 July 2014 until 1 January 2018.
- As of 2012, the only "economy" that was an associate member was CARICOM (Caribbean Community) – its membership comprising Antigua and Barbuda, Saint Kitts and Nevis, Barbados, Saint Lucia, Belize, Saint Vincent and the Grenadines, Dominica, Suriname, Grenada, Trinidad and Tobago and Guyana. Jamaica, although also a member of CARICOM, is an associate of the CGPM in its own right.
- In the case of France, the French Foreign Minister
- Argentina, Austria-Hungary, Belgium, Brazil, Denmark, France, German Empire, Italy, Peru, Portugal, Russia, Spain, Sweden and Norway, Switzerland, Ottoman Empire, United States and Venezuela.
- "Treaty of the Metre". Encyclopædia Britannica. 2013. Retrieved 28 March 2013.
- "BIPM – history". www.bipm.org. Retrieved 27 April 2018.
- "Magna Carta". Translated by Vincent, Nicholas. 6 October 2015. Retrieved 30 September 2012.
- Act of Union 1707, Article 3
- McGreevy, Thomas (1995). The Basis of Measurement: Volume 1 – Historical Aspects. Pitcon Publishing (Chippenham) Ltd. p. 166. ISBN 0-948251-82-4.
- "Histoire du mètre". Direction Générale des Entreprises (DGE). Retrieved 27 December 2017.
- McGreevy, Thomas (1995). The Basis of Measurement: Volume 1 – Historical Aspects. Pitcon Publishing (Chippenham) Ltd. pp. 145, 151. ISBN 0-948251-82-4.
- "A Note on the History of the IAG". IAG Homepage. Retrieved 16 May 2017.
- Clarke, Alexander Ross (1 January 1867). "X. Abstract of the results of the comparisons of the standards of length of England, France, Belgium, Prussia, Russia, India, Australia, made at the ordnance Survey Office, Southampton". Philosophical Transactions of the Royal Society of London. 157: 161–180. doi:10.1098/rstl.1867.0010. ISSN 0261-0523. S2CID 109333769.
- "BIPM – International Metre Commission". www.bipm.org. Retrieved 9 January 2018.
- Alder, Ken (2002). The Measure of all Things – The Seven-Year-Odyssey that Transformed the World. London: Abacus. pp. 348–354. ISBN 0-349-11507-9.
- Alder, Ken (2002). The Measure of all Things – The Seven-Year-Odyssey that Transformed the World. London: Abacus. p. 354. ISBN 0-349-11507-9.
- Pérard, Albert (1957). "Carlos IBAÑEZ DE IBERO (14 avril 1825 – 29 janvier 1891), par Albert Pérard (inauguration d'un monument élevé à sa mémoire)" (PDF). Institut de France Académie des Sciences. Archived from the original on 18 May 2017. Retrieved 18 May 2017.
- Soler, T. (1 February 1997). "A profile of General Carlos Ibáñez e Ibáñez de Ibero: first president of the International Geodetic Association". Journal of Geodesy. 71 (3): 176–188. Bibcode:1997JGeod..71..176S. CiteSeerX 10.1.1.492.3967. doi:10.1007/s001900050086. ISSN 0949-7714. S2CID 119447198.
- Encyclopædia Britannica. 08 (11th ed.). 1911. .
- McGreevy, Thomas (1995). The Basis of Measurement: Volume 1 – Historical Aspects. Pitcon Publishing (Chippenham) Ltd. pp. 150–151. ISBN 0-948251-82-4.
- Jabbour, Z.J.; Yaniv, S.L. (2001). "The Kilogram and Measurements of Mass and Force" (PDF). J. Res. Natl. Inst. Stand. Technol. 106 (1): 25–46. doi:10.6028/jres.106.003. PMC 4865288. PMID 27500016. Archived from the original (PDF) on 4 June 2011. Retrieved 28 March 2011.
- Materese, Robin (16 November 2018). "Historic Vote Ties Kilogram and Other Units to Natural Constants". NIST. Retrieved 17 November 2018.
- "BIPM statement: Information for users about the proposed revision of the SI" (PDF). Archived (PDF) from the original on 21 January 2018. Retrieved 5 May 2018.
- "Decision CIPM/105-13 (October 2016)". The day is the 144th anniversary of the Metre Convention.
- "The Metre Convention". Bureau International des Poids et Mesures. Retrieved 1 October 2012.
- "General Conference on Weights and Measures". Bureau International des Poids et Mesures. 2011. Archived from the original on 26 September 2012. Retrieved 26 September 2012.
- "General Conference on Weights and Measures approves possible changes to the International System of Units, including redefinition of the kilogram" (PDF) (Press release). Saint-Cloud, France: General Conference on Weights and Measures. 23 October 2011. Retrieved 25 October 2011.
- Convention of the Metre (1875), Appendix 1 (Regulation), Article 8
- "CIPM: International Committee for Weights and Measures". Bureau International des Poids et Mesures. 2011. Retrieved 26 September 2012.
- "BIPM – France [Member State]". www.bipm.org. Retrieved 5 January 2018.
- Convention of the Metre (1875), Appendix 1 (Regulation), Article 6
- "The BIPM headquarters". Bureau International des Poids et Mesures. 2011. Retrieved 26 September 2012.
- Convention of the Metre, Appendix 1 (Regulations), Articles 16 and 19
- "The BIPM headquarters". International Bureau of Weights and Measures. Retrieved 27 September 2012.
- "Protocol". Ministère Affaires étrangères, Republique Francaise [Ministry of Foreign Affairs, Republic of France]. 10 January 2011. Retrieved 27 September 2012.
- "System of Measurement Units". IEEE. Retrieved 1 October 2012.
- "Résolution 10 de la 8e réunion de la CGPM (1933) – Substitution des unités électriques absolues aux unités dites " internationales "" [Resolution 10 of the 8th meeting of the CGPM (1933) – Substitution of the so-called "International" electrical units by absolute electrical units] (in French). Bureau International des Poids et Meseures. 1935. Retrieved 2 October 2012.
- Kennelly, Arthur E (21 October 1935). "Adoption of the Metre-Kilogram-Mass-Second (M.K.S.) Absolute System of Practical Units by the International Electrotechnical Commission (I.E.C.), Bruxelles, June 1935". Proceedings of the National Academy of Sciences of the United States of America. 21 (10): 579–583. Bibcode:1935PNAS...21..579K. doi:10.1073/pnas.21.10.579. PMC 1076662. PMID 16577693.
- Resolution 6 – Proposal for establishing a practical system of units of measurement. 9th Conférence Générale des Poids et Mesures (CGPM). 12–21 October 1948. Retrieved 8 May 2011.
- Resolution 7 – Writing and printing of unit symbols and of numbers. 9th Conférence Générale des Poids et Mesures (CGPM). 12–21 October 1948. Retrieved 8 May 2011.
- Resolution 6 – Practical system of units. 10th Conférence Générale des Poids et Mesures (CGPM). 5–14 October 1954. Retrieved 8 May 2011.
- Resolution 12 – Système International d'Unités. 11th Conférence Générale des Poids et Mesures (CGPM). 11–20 October 1960. Retrieved 8 May 2011.
- "Practical realisation of the definitions of some important units". SI brochure, Appendix 2. BIPM. 9 September 2010. Retrieved 5 May 2011.
- International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), ISBN 92-822-2213-6, archived (PDF) from the original on 14 August 2017
- "BSI Education: Quality Management Systems". British Standards Institution (BSI). 2008. Retrieved 2 October 2012.
- "ISO 15195:2003 – Laboratory medicine – Requirements for reference measurement laboratories". International Organization for Standardization (ISO). Retrieved 2 October 2012.
- "Historical development of the CIPM MRA". Bureau International des Poids et Mesures. Retrieved 2 October 2012.
- "Text of the CIPM MRA". Bureau International des Poids et Mesures. 2003. Retrieved 15 October 2012.
- "The essential points of the CIPM MRA". Bureau International des Poids et Mesures. Retrieved 2 October 2012.
- "Directive 98/79/EC". 27 October 1998.
on in vitro diagnostic medical devices
- "JCTLM: Joint Committee for Traceability in Laboratory Medicine". Bureau International des Poids et Mesures. Retrieved 2 October 2012.
- "International Atomic Time". Bureau International des Poids et Mesures. Archived from the original on 10 January 2011. Retrieved 21 October 2012.
- Peter Mohr (6 December 2010). "Recent progress in fundamental constants and the International System of Units" (PDF). Third Workshop on Precision Physics and Fundamental Physical Constants. Archived from the original (PDF) on 24 August 2011. Retrieved 2 January 2011.
- Crease, Robert P (22 March 2011). "Metrology in the balance". Physics World. 24 (3): 39–45. Bibcode:2011PhyW...24c..39C. doi:10.1088/2058-7058/24/03/34. Retrieved 28 June 2012.
- Fischer, J.; et al. (2 May 2007). "Report to the CIPM on the implications of changing the definition of the base unit kelvin" (PDF). Retrieved 2 January 2011.
- "Resolution proposal submitted to the IUPAP Assembly by Commission C2 (SUNAMCO)" (PDF). International Union of Pure and Applied Physics. 2008. Archived from the original (PDF) on 27 September 2011. Retrieved 8 May 2011.
- Ian Mills (29 September 2010). "Draft Chapter 2 for SI Brochure, following redefinitions of the base units" (PDF). CCU. Retrieved 1 January 2011.
- "On the possible future revision of the International System of Units, the SI – Draft Resolution A" (PDF). International Committee for Weights and Measures (CIPM). Retrieved 14 July 2011.
- On the possible future revision of the International System of Units, the SI (PDF). 24th meeting of the General Conference on Weights and Measures. Saint-Cloud, France: International Bureau for Weights and Measures. 21 October 2011.
- "Historic Vote Ties Kilogram and Other Units to Natural Constants". NIST. 16 November 2018. Retrieved 16 November 2018.
- Milton, Martin (14 November 2016). Highlights in the work of the BIPM in 2016 (PDF). SIM XXII General Assembly. Montevideo, Uruguay. p. 10. Archived from the original (PDF) on 1 September 2017. Retrieved 21 November 2018.
- "Decision CIPM/105-13 (October 2016)". Archived from the original on 24 August 2017. Retrieved 31 August 2017.
- "General Conference on Weights and Measures". Bureau International des Poids et Mesures. 2011. Archived from the original on 26 September 2012. Retrieved 30 September 2012.
- "Members of the International Committee for Weights and Measures (CIPM)" (PDF). Bureau International des Poids et Mesures. October 2011. Retrieved 3 October 2012.
- "The Metre Convention". La métrologie française. 2012. Retrieved 3 October 2012.
- Quinn, Terry (2012). From Artefacts to Atoms: The Bipm and the Search for Ultimate Measurement Standard. Oxford University Press. pp. 133–135. ISBN 978-0-19-530786-3.
- "Member States". Bureau International des Poids et Mesures. 2016. Retrieved 10 May 2017.
- "The Republic of Serbia". BIPM official site. Archived from the original on 8 August 2014. Retrieved 30 July 2014.
- "Serbia and Montenegro". BIPM official site. Archived from the original on 8 August 2014. Retrieved 30 July 2014.
- The Heritage Portal > A Short History of the Metrication Movement in South Africa The South African Bureau of Standards (SABS) announced on 15 September 1967 that a Metrication Advisory Board would be established to plan and co-ordinate the change-over to the metric system and a Metrication Department would be set up to implement its policies. There would be a ten-year grace period to allow industry and the general public to adjust.
- BIPM official site:Procedure for a State or Economy to become an Associate of the General Conference Archived 3 July 2014 at the Wayback Machine
- "BIPM – Chinese Taipei".
- "BIPM - North Macedonia".
- Report of the President of the CIPM on the Work Accomplished since the 24th Meeting of the CGPM (PDF), Saint-Cloud: International Bureau for Weights and Measures, November 2014, p. 5.
- Proceedings of the 24th General Conference on Weights and Measures, 2011, page 437
- International Bureau of Weights and Measures official site: The Republic of Cameroon, retrieved 4 August 2013
- Lord, John (2001), "Spread of the Metric System", Sizes: The Online Quantinary, Santa Monica: Sizes Inc.
- "– Dominican Republic [Member State]". www.bipm.org. Retrieved 29 March 2017.
- "The Bolivarian Republic of Venezuela". BIPM. Retrieved 31 October 2019.
- "BIPM – Yemen".
- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica. 18 (11th ed.). Cambridge University Press. .
- Kershaw, Michael. "The ‘nec plus ultra’of precision measurement: Geodesy and the forgotten purpose of the Metre Convention." Studies in History and Philosophy of Science Part A 43.4 (2012): 563-576. online
- Quinn, Terry. "The Metre Convention and world-wide comparability of measurement results." Accreditation and quality assurance 9.9 (2004): 533-538.
- Stigler, S. The History of Statistics: The Measurement of Uncertainty before 1900 (1986).
- Text of the current version of the Convention (in French with unofficial translation in English at the end)
- Text in English, Library of Congress
- Text of the CIPM-MRA agreement
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