CHAPTER VIII.

_On the Melting of Silver._

Directions on Melting 94 Weighing Metal for the Crucible 94 Crucibles 95 Best Crucibles to employ 95 Fluxes: their Action on Crucibles 96 Fluxes employed in Melting 96 Testing the Soundness of a Crucible 97 Mixing various Metals for melting 97 Zinc a fusible Metal 98 Charcoal 99 Bad working Material 99 Plumbago Crucible for Melting 99 Tongs for Melting 100 Ingot-mould 100 Flux and the Pouring of Molten Metal 101 Protoxide of Zinc 102 Scrap Silver 102 Carbonate of Soda 102 Dissolving Impurities 103 Lead and Tin in Silver 103 Sal-ammoniac 103 Lemel 103 Mixture prepared for Crucible 104 Burning of Lemel 104 Skittle-pot for Lemel 104 Melting of Lemel 105 Another Mode of melting Lemel 106 Crucible for Lemel 106 Pouring of Lemel from Crucible 107