French metallurgists Jules Henri Debray and Henri…
1873 CE
French metallurgists Jules Henri Debray and Henri Étienne Deville examine alloys of platinum and iridium for the Russian government in 1873 to determine their suitability for coinage.
1873 CE
French metallurgists Jules Henri Debray and Henri Étienne Deville examine alloys of platinum and iridium for the Russian government in 1873 to determine their suitability for coinage.