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VI. NICKEL.
Ores; Fire Assay (Plattner's Assay)
Compounds free from Copper; Compounds containing Metallic
Sulphides; Arsenizing
PAGE
182
183
184
185
Compounds free from Sulphur and Rich in Arsenic; Reducing
and Solvent Fusion; Modifications which may occur
Arsenizing and Fusing in One Operation; Slagging off of the
Arsenical Iron
Modifications; Dearsenizing; Slagging off the Cobalt Arsenide 186
Cupriferous Compounds; When the Percentage of Copper is
Small
The Wet Method partially used when the Percentage of Copper is Large; The Processes; Nickeliferous Pyrrhotine
Compounds Difficultly Soluble, as, for instance, Slags; Com-
pounds containing Antimony
Wet Assay; Gravimetric Assay; Electrolytic Assay
Processes when Iron is Present in Small and Large Quantities
Process when Zinc is Present.
Determination of Nickel in Pyrites and Matt
Other Assays
The Separation of the Iron; Nickeliferous Solution from the
Assay with Sulpho-cyanide for Determining Copper in Nickel
Coins
Volumetric Assay with Sodium Sulphide
Separation of Cobalt, Colorimetric Assay
196
197
198
VII. COBALT.
Ores
Assays of Cobalt; Object of the Assays; Determination of
Cobalt by the Dry or Wet Method; Determination of the
Blue Coloring Power (Density), and the Beauty of the
Colors; Smalt Assay .
Wet Assays; Gravimetric Assays-Determination of Zinc as
207
209
Treatment when Copper is present; Volumetric Assays; Schaff-
ner's Assay with Sodium Sulphide
Indicators for Recognizing the Final Reaction
Points to be Observed-The Quantity of the Hydrated Ferric
Oxide; Shade of Coloration of the Hydrated Ferric Oxide;
The Quantity of fluid; Measuring the Volume of Liquid
Removal of Admixtures having a Disturbing Effect-Copper-
Manganese
Removal of Lead; The Zinc used for fixing the Standard Solu-
tion; Arrangement of the Light in the Room; Assay with
Potassium Ferrocyanide
Schober's Volumetric Assay
210
211
212
213
Saxon Assay of Tin; Determination of Tin by Washing, in
Cornwall; Fire Assays
German Assay
214
215
216
Modifications which are necessary-when the Ore contains many
Earthy Admixtures; When the Ore contains Foreign Metal-
lic Sulphides, Arsenides, and Antimonides; On Account of
the Ease with which Tin Oxide is Slagged off
When Separate Grains of Tin are found; When Tin Oxide is
combined with Silicate (as, for instance, in Tin-ore Slags) . 218
Cornish Assay of Tin
Levol's Assay with Potassium Cyanide
217
Wet Assays; Gravimetric Assays
221
Volumetric Assays; Determination of Tin by means of Iodine 222
Determination of Tin by means of Potassium Permanganate
XI. BISMUTH.
223
Ores; Fire Assays; Ores and Compounds free from Sulphur
(Native Bismuth, Tetradymite, Bismuthic Cupel Ash, etc.). 224
Sulphurized Bismuth Ores; Various Processes
Wet Assays; Assay of Ore; Separation of Bismuth from Lead;
According to Patera
225
226
Determination of the Percentage of Lead and Silver; According
to Ullgreen; Tin Oxide; Lead and Bismuth
227
XII. MERCURY.
Ores; Fire Assays; Assays yielding free Mercury
Different Processes; Combustion Furnace
Assays in which the Mercury is Determined in Combination
with Gold; Eschka's Process
Kustel's Assay; Assay of Cinnabar; Wet Assays; Gravimetric
Assay
Volumetric Assays
XIII. ANTIMONY.
Ores; Fire Assays
Liquation Process for Determining Antimonium Crudum;
Determination of Antimony in Antimony Sulphide; Assay
by Precipitation
Roasting and Reducing Assay
Wet Assays; Gravimetric Assay; Volumetric Method
XIV. ARSENIC.
Ores; Fire Assays; Native Arsenic
Arsenious Acid
Realgar (Red Orpiment) and Yellow Orpiment; Assays for the
Determination of Realgar; Assay for the Determination of
Yellow Orpiment; Wet Assays; Gravimetric Assays; Wet
Wet Method combined with the Dry
Volumetric Assays; Mohr's Estimation of Arsenious Acid
XV. URANIUM.
Ores; Wet Assays; Gravimetric Assays; More Accurate Ana-
Ores; Wet Assays; Gravimetric Assays; Direct Assay; Pour-
Volumetric Assays; Bunsen's Method with Iodine
Apparatus; Levol's Method with Iron
XVIII. SULPHUR.
241
242
243
245
246
248
249
251
252
255
256
Assays by Distillation for the Determination of the amount of
Sulphur which an Ore may yield; Sulphur Earths; Iron
Pyrites
Assays of Sulphur for the Determination of the quantity of Sul-
phur contained in a substance; Dry Assay (Raw Matt Assay) 258
Wet Assays; Gravimetric Assay
ssays of Fuel; Determination of the amount of Hygroscopic
Water; Yield of Carbon
263
Determination of the Coking quality of Coal; Volatile Products;
Determination of the Ash .
264
Amount of Ash in different kinds of Fuel; Determination of the amount of Sulphur contained in a Coal or its Ash
Determination of Heating Power; Berthier's Method of Deter-
mining the Absolute Heating Power
Physical and Chemical Behavior
Examination of Furnace Gases; Orsat's Apparatus
Bunte's Burette
265
266
268
269
272
APPENDIX.
A. TABULAR SYNOPSES
1. Atomic Weights.
2. Fusing Points of Metals and Furnace Products; Glow-
ing Temperatures
3. Fusing Points of Metals, Alloys, Furnace Products,
Rocks, and Silicates, according to Erhard and
Schertel.
B. LOWER HARZ WORKING ASSAYS
Lead; Copper
Iron; Zine; Silver; Gold
276
278
279
280
Sulphur.