The refined platinum (3.6 Troy Ounces) supplied to Micheal Faraday for the flint glass lens of the Royal Society by Percival Norton Johnson was likely at cost, below market.
September, 1828: 1 Troy Oz. Platinum (producer) = £ 0.97 (USD$ 4.79)
September, 1828: 1 Troy Oz. Platinum (scrap) ~ £ 0.45 (USD$ 2.35)
Citation: Philosophical transactions of the Royal Society of London ..., Vol.120 By Royal Society (London) p.
A Viennese librarian, educator, journalist and minor historian of Austrian banking*, Emerich Thomas Hohler (1781-1846) closely analyzed the Platinum metal price & coin value.
His valuation - based on St. Petersburg & London metal-market prices for 1829, presumably - was repeated (without correction nor update) for more than a decade in other Germanic texts. The Gold-Price, Silver-Price and Platinum-Price were, in fact, fluctuated separately in different markets - as von Humbolt had predicted (Correspondence w/ Count Cancrin, November 19, 1827.)
* See "Historisch-politische Erläuterungen über Bank- Anstalten überhaupt und über die Oesterreich Nationale Bank insbesondere" (1816: Octavo in 68 Pages)
c.1828/9: London Gold/Platinum/Silver at ratios 1: 3.3125 :15.50
1828/9: 1 Troy Oz. Platinum (mkt, London) ~ £ 1.28 (USD$ 6.32)
1829: 1 Troy Ounce Platinum (semi-mfg, London) = £ 1.25 (USD$ 6.08)
1829/30: 1 Troy Oz. Pt (semi-mfg, St. Petersburg) ~ 32.66 руб (USD$ 6.53)
c.1829-30: 1 Troy Oz. Platinum (intrinsic) = £ 1.25 - 1.00 (USD$ 6.08 - 4.82)
The Russian intent to coin Platinum was 'news' in December 1828 and early 1829, although the Imperial decree was issued in April 1828.
January, 1829:
Citation: The London Literary Gazette and Journal of Belles Lettres, Arts, Sciences, Etc #627
1829:
Citation: Neues Archiv für Geschichte, Staatenkunde, Literatur und Kunst, Vol. 2 (Jan. 1830) p.2
Early-Mid 1829:
Citation: The Edinburgh new philosophical journal, Vol. 13 (1832) p.190
c. August 1829
Citation: On the practicability of an invasion of British India; George de Lacy Evans (1829)
Falling price, c. 1829/30
1829: Averaging Gold Rates & Silver Rates > Gold £ 4.2556 : Silver £ 0.2745 = 1: 15.50
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