Palladium Hydrogenium

Graham, Thomas (maker)

Science Museum

Science Museum
London, United Kingdom

Pattern half-sovereign or trial piece, inscribed Palladium-Hydrogenium, [Thomas] Graham, 1869. 19mm diameter, in brown case 4x4x1cm. Obverse, head of young Queen Victoria. Reverse, inscription. Inside case inscribed in medal mount: This medal contains 173cc of 900 vols of hydrogen; palladium can absorb up to 900 times its own volume of hydrogen.


  • Title: Palladium Hydrogenium
  • Creator: Graham, Thomas (maker)
  • Date Created: 1869
  • Location: London, Greater London, England, United Kingdom
  • Physical Dimensions: diameter: 19 mm, weight: 0.0354kg
  • Type: medal

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