Watchmakers' and jewelers' practical receipt book. A workshop companion .. (1892)
[Walker, C. E.], watchmaker. [from old catalog] · Chicago, G. K. Hazlitt & co. · leaf 91
r PRACTICAL RECEIPT BOOK. 87 has entirely disappeared, add to the two and a half ouncesof solution nearly one quart of pure rain water. Thensink a sheet of clean copper into it; the silver will collectrapidly upon the copper, and you can scrape it off andmelt it in a bulk. 88 WATCHMAKERS AND… … Gold Alloys. Take 600 grains of the gold-bearing quartz, finely pul-verized, and free from sulphurets; mix with 600 grainslitharge, and 7 grains charcoal; melt all in crucible ofample size, and set off to cool. Break the crucible whencold, and the gold will be found in a small button underthe…
Jewelry · Clock and watch making
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