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An air refractometer for interference length metrology
A refractometer for the measurement of the refractive index of the surrounding air is described, in which interference fringes are produced between two beams, one propagated in air, the other inExpand
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NEWS FROM THE BUREAU INTERNATIONAL DES POIDS ET MESURES: Meeting of Section 1 (X- and gamma-ray measurements) of the Comité Consultatif des étalons de mesure des rayonnements ionisants
The Comit6 Consultatif pour la DBhition du Mktre (CCDM) met a t the Pavillon de Breteuil on 13 t o 15 June 1973, and reached some important agreements concerning the values to be used for theExpand
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Standards of length and time
The Pt-Ir bar, international prototype of the metre, was one hundred times less precise as a length standard than the orange line of 86Kr by which the metre has been defined since 1960. MolecularExpand
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The Work of the Bureau International des Poids et Mesures concerning Electromagnetic Units and Measurements
The purpose of this paper is to survey the basic background of electric measurements, including definition of the base units, and description of the base standards from which most electromagneticExpand
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