"Some time ago" must refers to the Paris price in Specie-Money before 1811, ~5 years prior: this Thaler price corresponds to Jeannetty's prices before Cuoq & Couturier began merchandising Breant's Platinum (1814.)
c.1808-10: 1 Troy Oz. Platinum (refined, Paris mkt) = Thlr 8.51 (Fr 30. -32.)
In 1813, where £ 1. = Thlr. 4.555 (Berlin) and although the London price was £ 0.875:
1813: 1 Troy Oz. Platinum (refined, London retail) ~ Thlr 4.25 (£ 0.934)
c.1813:
V. Die neuesten Ansichten, Erfahrungen und Beobachtungen über die Metalle, ihr Vorkommen in der Natur, ihre Eigenschaften und ihre Anwendung im menschlichen Leben. (Vom Herrn Assessor Schrader.) (Fortsetzung von B. I. ; S. 21 2c.)
The price of platinum has long been much lower than gold. Some time ago in Paris, a Loth of worked platinum cost only 4 Rthlr in our specie, and in London it's now only half that price.
Citation: Museum des Neuesten und Wissenswürdigsten aus dem Gebiete der ..., Vol. 4; Sigismund Friedrich Hermbstaedt (1815) p.54
c.1810:
"An even greater difference than in the purity is between prices of platinum from Wollaston and Janetty. From the former, Platinum costs twelve shillings the ounce, from the latter one pays 36 francs an ounce, and scrap platinum is taken in at 15 francs again. The difference is a little stark. You could betommen crude platinum in Paris to a maximum of 12 francs the ounce. One has therefore enough to the self-editing and then still have the new metals."
Gehlen's complaint of Janetty's manufacture appears confirmed by widely different thermo-electric conductivity for platinumware.c.1808-10: 1 Troy Oz. Platinum (refined, Paris mkt) = Thlr 8.51 (Fr 30. -32.)
In 1813, where £ 1. = Thlr. 4.555 (Berlin) and although the London price was £ 0.875:
1813: 1 Troy Oz. Platinum (refined, London retail) ~ Thlr 4.25 (£ 0.934)
c.1813:
V. Die neuesten Ansichten, Erfahrungen und Beobachtungen über die Metalle, ihr Vorkommen in der Natur, ihre Eigenschaften und ihre Anwendung im menschlichen Leben. (Vom Herrn Assessor Schrader.) (Fortsetzung von B. I. ; S. 21 2c.)
The price of platinum has long been much lower than gold. Some time ago in Paris, a Loth of worked platinum cost only 4 Rthlr in our specie, and in London it's now only half that price.
c.1810:
"An even greater difference than in the purity is between prices of platinum from Wollaston and Janetty. From the former, Platinum costs twelve shillings the ounce, from the latter one pays 36 francs an ounce, and scrap platinum is taken in at 15 francs again. The difference is a little stark. You could betommen crude platinum in Paris to a maximum of 12 francs the ounce. One has therefore enough to the self-editing and then still have the new metals."
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