Medal commemorating the life of Thomas Graham, 1869.

Minton, J W

 
Medal commemorating the life of Thomas Graham, 1869.
4 0 c m
 
29cm
actual image size: 21cm x 32cm

Description

The medal is inscribed 'Palladium-hydrogenium 1869 Graham'. The chemist Thomas Graham (1805-1869) showed that hydrogen readily penetrated the crystal lattices of certain metals, a proces he called 'occlusion'. Iron, platinum and especially palladium are affected. He supposed that hydrogen gas was the vapour of a very volatile metal hydrogenium which formed an alloy with palladium.

© Science Museum / Science & Society Picture Library

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