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1887
Volume 17, Issue 2
  • ISSN: 0032-1400

Abstract

The original metric standard of weight adopted in 1799 was a kilogram fabricated from platinum. The presentinternational standard kilogram was made nearly a century ago from 10 per cent iridium-platinum. Johnson Matthey was deeply concerned with this work and since then has regularly supplied further national prototypes and working standards toastrict specification.

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1973-01-01
2024-06-22
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References

  1. McKie D. “Antoine Lavoisier”, Constable, London, 1952, 335 pp. [Google Scholar]
  2. McDonald D. “A History of Platinum”, Johnson Matthey, 1960, 127129 [Google Scholar]
  3. McDonald D. Platinum Metals Rev., 1968, 12, (4), 142145 [Google Scholar]
  4. McDonald D. “A History of Platinum”, Johnson Matthey, 1960, 207213 [Google Scholar]
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  • Article Type: Research Article
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