## The International Bureau of Weights and Measures, 1875-1975: Translation of the BIPM Centennial Volume, Volume 13 |

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activity adopted allows atomic balance base beam better BIPM Bureau called carried cavity cells CGPM chamber CIPM comparator comparison constant Convention correction corresponding counting defined definition density determination difference direction distance effect electric electrons emitted energy equal established example exposure fact field Figure fixed flux force French frequency fringes given gives important increase intensity International ionization Italy Kilogram known laboratories lamp laser length less light lines luminous maintained mass means mercury method metre metric metrology mirror natural necessary needed neutrons observed obtained operation organizations original Paris particles permits photometry photons physical placed platform position possible practical precision present pressure produced prototypes quantities radiation realized reference relative requires resistance scale solution stability standards temperature thermometer tion uncertainty units various volume wavelength Weights and Measures

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Page 135 - The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 X 10"7 newton per meter of length.

Page 222 - Affairs, his Envoy Extraordinary and Minister Plenipotentiary at Paris. His Majesty the King of Italy: His Excellency Count Nigra, his Ambassador at Vienna, Senator of the Kingdom; Count A.

Page 135 - The volt is the difference of electric potential between two points of a conducting wire carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt.

Page 221 - His Majesty the King of Roumania; His Majesty the Emperor of all the Russias; His Majesty the King...

Page 73 - The metre is the length equal to 1 650 763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p,0 and 5d5 of the krypton-86 atom.

Page 222 - Commander of His Orders of St. Maurice and St. Lazarus, and of the Crown of Italy...

Page 124 - The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water (13th CGPM, 1967).

Page 159 - New Apparatus at the National Bureau of Standards for Absolute Capacitance Measurement, IRE Trans.

Page 221 - Knight of the Order of the Elephant, of the Order of the Annunciation, of the Black Eagle, and of the Red Eagle, of the Seraphim, of St.

Page 135 - The ohm is the electric resistance between two points of a conductor when a constant difference of potential of...