cupel

How To Use cupel In A Sentence

• When the cupel shows signs of the presence of these metals in objectionable quantity, it is well to repeat the assay and scorify so as to remove them before cupellation. A Text-book of Assaying: For the Use of Those Connected with Mines.
• To them is due the discovery of antimony, sulphuric ether and phosphorus, the cupellation of gold and silver, the determining of the properties of saltpetre and its use in gunpowder, and the discovery of the distillation of essential oils. The Majesty of Calmness; individual problems and posibilities
• The lead alloy was then separated into its component metals by cupellation.
• In the latter case it is best to scorify the lead down to something less than 1 gram, and to perform the cupellation on a specially prepared small fine cupel. A Text-book of Assaying: For the Use of Those Connected with Mines.
• But the satisfaction was at its height when the crucible produced, after cupellation, a button of The Land of Midian
• The bad effect of a higher temperature in increasing the cupellation loss need hardly be considered in the case of such small buttons of gold as are obtained in assaying gold ores, as any loss there may be is hardly appreciable by the balance. A Text-book of Assaying: For the Use of Those Connected with Mines.
• The assay of gold-zinc slimes, which is the precipitate formed by zinc acting on cyanide solutions of gold, may be made by wrapping 2 or 3 grams in 40 grams of sheet lead and scorifying, cupelling, &c. The amount of impurity in the stuff varies greatly; it is usually calcined and mixed thoroughly with soda 40 per cent., borax 30 per cent., and sand 10 per cent., and melted in graphite pots. A Text-book of Assaying: For the Use of Those Connected with Mines.
• According to our shopper, the assayer would make up a tray of aged bone-ash, magnesium or cement cupels into which crushed ore along with a button of lead was added.
• FIRE ASSAY* smelting with gold collector, separation, cupellation muffle or retort furnace, crucible, cupel taste (assay) lead, borax, soda, potash chemical Chapter 20
• Refer to the table on page 105 to find what weight of lead is required for cupelling A Text-book of Assaying: For the Use of Those Connected with Mines.