Diagrams, hemispheres of gold and platinum by Edward Matthey Five diagrams of spheres and hemispheres of gold and platinum. Matthey describes the diagrams in the accompanying paper: 'Having been struck by the experiments made by Professor Roberts- Austen [...] I cast some gold containing platinum into a special iron mould 3 inches in diameter, and cut the spheres of metal so obtained in two halves [...] Portions were then carefully taken from each of the points marked on the diagrams A, B, and C given herewith, and the results of the assays of the metal taken at each point of the hemispheres are indicated on the diagrams.' Subject: Metallurgy Prints of these diagrams were published in volume 47 of the Proceedings of the Royal Society alongside the paper 'The liquation of gold and platinum alloys'. 1890