Page:Proceedings of the Royal Society of London Vol 60.djvu/36

28 F ig. 4.

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:—

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 :—