The Silversmith's Handbook Containing full instructions for the alloying and working of silver
CHAPTER IV.
_The Cupellation of Silver Ores._
Test-ring 31 Preparation of Bone-ash 32 Defects in Bone-ash Cupel 33 Currents of Air to the Furnace 33 Withdrawal of the Silver from the Cupel 34 Removal of the Litharge, Manner of 35 Quantity of Alloy per Cupel 35 Purity of Silver after Cupellation 37 Ancient Method of Assaying 37 Dr. Lamborn on Assaying 38 Scriptural Testimony 37, 38 English System of Assay 39