THE ninth International Conference of Weights and Measures was held in Paris in October last. Under the terms of the international treaty known as the convention du Métre, these Conferences should be held every six years. But on this occasion the conference which should have taken place in the autumn of 1939 had had to be deferred, owing to the Second World War, until 1948, with the result that the normal interval was increased to fifteen years.
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Ninth International Conference of Weights and Measures. Nature 163, 427–428 (1949). https://doi.org/10.1038/163427a0