CHAPTER V.

_The Alloys of Silver._

Silversmith's Alloys 40 Filigree Work 40 Alloy 41 Amalgam 41 Metals employed in the Industrial Arts 41 Metals, their various Characteristics 41 Principal Alloys of Silver 42 Copper 42 Characteristics of Copper 43 Protoxide of Copper 44 Action of Acids on Copper 44 Bean-shot Copper for Alloying 44 Chemical name for Copper 44 Nickel 45 Cronstedt 45 Density of Nickel 45 Ductility of Nickel 45 Malleability of Nickel 45 Fusibility of Nickel 45 Nickel Coinage 45 Nickel Alloys 46 Electro-plate 46 Zinc 46 Spelter 46 Zinc in Silver Solder 46 Annealing of Zinc 47 Specific Gravity of Zinc 47 Spelter used by Jewellers 47 Tarnishing of Zinc 47 Malleability of Zinc 48 Ductility of Zinc 48 Tenacity of Zinc 48 Tin 48 Ancient Workers in Tin 48 Density of Tin 48 Christianity and Tin 48 Fusibility of Tin 48 Dissolving of Tin 48 Tin alloyed with Gold 49 Tin alloyed with Silver 49 Tin in Silversmith's Solders 49 Vapours of Tin injurious to Gold 49 Malleability of Tin 49 Ductility of Tin 49 Tenacity of Tin 49 Scientific Name for Tin 50 Table of Metallic Elements 50 Melting-points of the Principal Metals 51 Physical Properties of the Principal Metals 51