FOOTNOTES:
[126] The 10 in 20 multiplied by 10 = 100 in 200.
[127] Multiply the errors for 100 by the square root of 10.
[128] Multiply the errors for 100 by the square root of 6990.
[129] Sp. Gr. 5.8. Silver 60 per cent.
[130] Taking 28 as the limit of variation on 100.
[131] The weight of the ore less the weight of ruby silver in it.
INDEX.
Acid measures, 49
Acidimetry, 323
Acidity of ores, 168
Acids, 54
strength of, 54, 75, 436
Air of mines, carbonic acid in, 428
Alkalies, 330
determination of, 331
Lawrence Smith's method for, 333, 412
separation of, 332
Alkalimetry, 323
Alkaline earths, 320
Alumina, 314
determination of, 315
in mineral phosphates, 316
separation of, 314, 316
Amalgamation, 126
Ammonia, detection of, 341
determination of, 342
in natural waters, 353
Antimony, 225
detection of, 227
dry assay for, 226
gravimetric assay, 228
separation of, 228
volumetric assay, 229
Arsenic, 381
detection of, 381
dry assay for, 382
gravimetric assay, 383
in brimstone, 393
in crude arsenic, 388, 393
in mispickel, 125, 392
iodine, assay for, 386
separation by distilling, 384
uranium acetate, assay for, 389
Volhard's method applied to, 124
Assay book, 11
note, 12
results, 7
tons, 13, 131
Assaying, 1
methods, 15
Assays, check, 154
preliminary, 147
Atomic weights, 69
table of, 433
Barium, 326
Baryta, 326
Barytes, sulphur in, 378
Base bullion, sampling of, 157
Basic acetate separation, 233
Baum?'s hydrometer, 77
Beryllia, 319
Bismuth, 220
colorimetric assay, 223
detection of, 221
gravimetric determination of, 222
in commercial copper, 208
separation of, 222
Black tin, 271
an analysis of, 287
assay of, 276
copper in, 204
examination of, 285
separation by vanning, 272
Blank assays, 34
Blende, sulphur in, 375
zinc in, 266
Book, assay, 11
laboratory, 10
sample, 9
Boracic acid.
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