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28
Mr. E. Matthey
F ig. 4.
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This sphere seems constant all over.
In order to see what was the effect with pure gold alloyed with metallic zinc only, I cast an alloy of fine gold with 5 per cent, of zinc into a 3-in. spherical mould. The weight of the sphere was 3'438 kilograms.
The results were as follows:—
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Fig. 5. (Five per cent. zinc.
A slight hut decided tendency of liquation of gold towards the centre.
The same alloy, containing 95 per cent, of gold and 5 per cent, of zinc, was then alloyed with a further 5 per cent, of zinc and cast into the same sphere. This weighed 4*218 kilograms. The results were as follows :—
