1878/9: 1 Troy Oz. Pt-Ir Alloy Labor (London: Mfg Cost) = Fr 14.81 (USD$ )
Where the Standard International Meter weighed 3.25 kg (104.5 Ozt), Johnson-Matthey's charge for 6.5 kg (209 Ozt) of manufactured Platinum-Iridium alloy, delivered:
1879: 1 Troy Oz. Pt-Ir Alloy (London: Mfg) = Fr 61.47 (USD$ )
Citation: Procès-verbaux des séances; International Bureau of Weights and Measures
1879: Oertling Balance Pan, Fr. 134.28
BELGIUM:
1875: 1 Troy Oz. Platinum (London: Intrinsic) = Fr 32.66 ($ 6.28)
1879: 1 Troy Oz. Platinum (London: Intrinsic) = Fr 37.324 ($ 7.18)
In reply, (to Ignatz Sroof, Direcrtor of the Griesheim Works near Hoechst/Frankfurt, Bavaria) Gustav Delplace of Namur Belgium cited Belgian prices for Platinum acquired from Johnson Matthey:
In the past 5 years, the price for 1 kg refined platinum fluctuated between Fr. 1,050 and Fr. 1,200 depending on the market price for the ore. {...} For the past 5 years, my apparatuses are from the platinum manufacturers Johnson Matthey & Company (Hatton Garden) made in London.
Citation: Chemie-Arbeit in Werk und Labor, Vol. 3 1/1880 p.11
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