This page needs to be proofread.
30
Mr. E. Matthey.
F ig. 8.
An image should appear at this position in the text. To use the entire page scan as a placeholder, edit this page and replace "{{missing image}}" with "{{raw image|Proceedings of the Royal Society of London Vol 60.djvu/38}}". Otherwise, if you are able to provide the image then please do so. For guidance, see Wikisource:Image guidelines and Help:Adding images. |  |
(Fifteen per eent. zinc.)
It is abundantly evident therefore, that zinc alone will not account for the differences in the ingots of impure gold ; and the question arose, will the presence of a definite amount of silver in any way prevent the irregularity in composition ?
To test this I alloyed the gold, which contained 15 per cent, of zinc so that it might also contain 7‘5 per cent, of silver.
This was cast into the 3-in. sphere and weighed 3'934 kilograms, and assays made on portions of metal cut from it gave the following results :— Fig.- 9.
(Fifteen per cent, zinc.)
It was intended to contain— Zinc................. 15-0 Silver ................. 7‘5 Gold................. 77,5
