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The BIPM from 1875 to the Present Day
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The Origins of the Château de Saint-Cloud (1577-1658)
Monsieur, Duc d'Orléans and the Trianon de Saint-Cloud (1658-1701)
The Pavillon du Mail
The Baron de Breteuil and the Pavillon de Breteuil
The Pavillon d'Italie and Napoléon Bonaparte
The Restoration
The Residence of Princesse Mathilde
The 'siège de Paris' (1870) and the Convention of the Metre
The BIPM from 1875 to the Present Day
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Directors of the BIPM since 1875
Scientific work at the BIPM today
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10th CIPM, 1894 2nd CGPM, 1895

Thus began the present existence of the Pavillon de Breteuil. In 1884 the laboratory building called the Observatoire was opened, and in 1889 the 1st Conférence Générale des Poids et Mesures sanctioned the new international prototypes of the metre and kilogram and formally required that they be deposited at the Pavillon de Breteuil. The Observatoire was extended in 1929 thanks to a gift by the Rockerfeller Foundation. Since then, extensions of the activities of the BIPM have required the construction of additional buildings: in 1964 two laboratory buildings were opened for work on ionizing radiation (these required an extension to the site, bringing it to about 4 hectares); in 1984 a building for laser work was opened; in 1988 a new library and office building was inaugurated; and, most recently, the Pavillon du Mail was inaugurated in 2001.

Since 1875 there have been thirteen directors of the BIPM and they have all, with the exception of Govi, during whose time the Pavillon de Breteuil was being repaired, resided in the Pavillon de Breteuil.

The status of the BIPM vis-à-vis the French Government was formalized in an agreement signed on 25 April 1969 between the Comité International des Poids et Mesures and the French government. The site of the Pavillon de Breteuil is now considered international territory and the BIPM has all the rights and privileges accorded to an intergovernmental organization.

The Baron de Breteuil would, we hope, have been pleased to know that, after its chequered early career, the pavillon that bears his name in the Parc de Saint-Cloud has become the permanent home of an international scientific organization, known the world over for the precision of its work.

[Updated 2013]

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Directors of the BIPM since 1875
Scientific work at the BIPM today