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25.4 millimeters accuracy adopted as exact basis Bearce Britain British imperial yard British inch British yard Bureau of Standards decimal fractions define the yard definition determined by Michelson distance in space Fabry fundamental standard gear train humidity inches and millimeters International Astronomical Union International Bureau International des Poids international meter lead screw LENGTH OF CADMIUM length of red lengths of light light waves Measurements in Terms measurements of length Mendenhall order meter in terms metric systems metrology number of millimeters Number of wave official relation Perot physical embodiment platinum-iridium Poids et Mesures pressure primary standard red cadmium light red radiation relation 1 inch relation between yards science and industry Scientific Papers screw threads secondary standards simple relation standard conditions standard meter standard of length standard yard system of units terms of light unit of length United States inch United States yard waves per meter Weights and Measures yards and meters