Page:Proceedings of the Royal Society of London Vol 60.djvu/42

34 Fig. 11.

Very marked, separation takes place in both instances, the differences at various points of the sphere being very remarkable and forcibly illustrating the difficulties to which reference is made at the commencement'of this paper.

As, however, it appears, that when a certain amount of silver is present, the irregularity in composition disappears, I alloyed this mixture of—

with more silver, so that it contained 15 per cent, of silver (nearly half the united amounts of zinc and lead present in the alloy).

This, cast into the 3-in. spherical mould, showed the following results at the points indicated. In appearance, the metal, when sawn in two, was homogeneous. The weight of the sphere was 3*459 kilograms.