1848:
1854/5: In the US, where Platinum was $8./oz Troy, the Platinum Sponge for the Hydrogen Lamp was USD$0.38, or 21 Platinum Sponges per Troy Ounce.
1857: In the US, where Platinum was $8./oz Troy, the Platinum Sponge was USD$0.38, or 21 Platinum Sponges per Troy Ounce.
mm
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