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La proposition de symposium de Martina Schiavon et de Laurent Rollet dans le cadre de l'European Society for the History of Science Biennial Conference and British Society for the History of Science Annual Meeting, qui aura lieu à Londres du 14 au 17 septembre 2018, a été acceptée.Voici le résumé du symposium "The Bureau des longitudes (1795-1932) Cooperation and competition networks"Created in 1795, the Bureau des longitudes was an international academy devoted to science and technology: a place for collective expertise and an advisory committee for the French government. It played a primary role in the organization and development of astronomy and celestial mechanics, the adoption of the decimal metric system, the definition and implementation of times scales, the emission and transmission of time signals, the development of earth physics and dynamical geodesy and the organization of major scientific expedition. From the 19th to the 20th century, its prestigious members – scientists, military and navy officers, and precision instrument makers – organized and participated to various national and international projects: the international geodetic association, the spread of standardization and the study of units of measurement, the emission of time signals, the adoption of Greenwich meridian, … The Bureau des longitudes is thus a crucial place to study various cooperation and competition processes: from science to technology passing through military, from scientific diplomacy to politics passing through economy, and reverse. This symposium will be devoted to the analysis of these question, more precisely:Circulation and priority conflicts about instruments and scientific discoveries / Influence of wars on scientific organizations / Cooperation, rivalry and priority dissensions / Conflicts / collaboration between amateur and expert / Editorial rivalries (for instance between La connaissance des temps and others ephemeris) / Metrology, metrical system, almanac and annuaires / Professional and institutional rivalries (scientists, military men, precision instrument makers, etc.) / Unity and discord between Center(s) and Peripher(ies)BibliographySchiavon, Martina and Rollet, Laurent (eds.) (2017), Pour une histoire du Bureau des longitudes (1795-1932) (Nancy: PUN-Éditions universitaires de Lorraine).Il est encore possible de soumettre des abstracts pour ce symposium (avant le 28 février 2018).