Abstract
ABOUT ten years ago, Messrs. Adam Hilger, Ltd., the well-known firm of optical instrument makers, first undertook to place on the market substances of a high degree of purity such as could be relied upon for the exacting requirements of spectroscopic work. It was intended that such supplies should not only be the purest obtainable by modern technique, but should also be accompanied by a detailed report of the exact amounts of residual impurities as measured by both chemical and spectroscopic methods. In some cases, indeed, so pure have been the products obtained, that pnty quantitative spectroscopic analysis has been available. Messrs. Hilger have obtained their supplies from specialists in all parts of Europe and the United States, and they have been produced in the laboratories of universities, technical institutes, industrial works, and of private individuals, as well as from the National Physical Laboratory.
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JOHNSON, R. Spectroscopically Pure Substances. Nature 133, 880 (1934). https://doi.org/10.1038/133880a0
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DOI: https://doi.org/10.1038/133880a0