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Beginning in 1957, the company published the journal Platinum Metals Review with the support of the Rustenburg Platinum Mines. [7] [8] In the 1960s Johnson Matthey formed a subsidiary, Johnson Matthey Bankers (JMB), which took its seat in the London Gold Fixing. In the early 1980s the bank expanded its activities outside the bullion business ...
Police also recovered ten bullion bars bearing the refiner's mark and serial numbers of bars stolen in the Brink's-Mat robbery. [54] According to the police spokesman, the bars were gold-coated tungsten counterfeits, and therefore could not be Johnson Matthey's stolen gold bars. He said that the arrested men planned to fraudulently claim they ...
Johnson Matthey Technology Review, known as Platinum Metals Review before 2014, is a quarterly, open access, peer-reviewed scientific journal publishing reports on scientific research on the platinum group metals and related industrial developments. [1]
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The international prototype of the kilogram (IPK), a cylinder made of platinum–iridium, and the international prototype of the metre, an X-cross-section bar also made from platinum–iridium, were selected from batches manufactured by the British firm Johnson Matthey. Working copies of both artifacts were also selected by lot and other copies ...
The unit of length is the metre, defined by the distance, at 0°, between the axes of the two central lines marked on the bar of platinum–iridium kept at the Bureau International des Poids et Mesures and declared Prototype of the metre by the 1st Conférence Générale des Poids et Mesures, this bar being subject to standard atmospheric ...
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He went into full partnership with George Matthey, a stockbroker, in 1851. [1] His expertise in refining earned his business the appointment of Assayer to the Bank of England in 1852. [1] He was also active in silver-mining and in 1854 moved to Stoke Fleming [2] in Devon where he had mining interests. [1] He retired in 1860 and died in 1866. [1]
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