![](https://coimages.sciencemuseumgroup.org.uk/58/134/medium_thumbnail_1983_0583__0002_.jpg)
Half sovereign or trial piece, inscribed Palladium Hydrogenium
- maker:
- Thomas Graham
![Half sovereign or trial piece, inscribed Palladium Hydrogenium](https://coimages.sciencemuseumgroup.org.uk/655/848/small_thumbnail_smg00009595__0001_.jpg)
![Half sovereign or trial piece, inscribed Palladium Hydrogenium](https://coimages.sciencemuseumgroup.org.uk/655/849/small_thumbnail_smg00009595__0002_.jpg)
![Pattern half-sovereign or trial piece](https://coimages.sciencemuseumgroup.org.uk/297/757/small_thumbnail_smg00009595.jpg)
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.
Details
- Category:
- Coins, Medals & Tokens
- Object Number:
- 1973-416/2
- Materials:
- palladium and hydrogenium
- Measurements:
-
diameter: 19 mm,
weight: .0354kg
- type:
- medal
- credit:
- Chemical Society