 | Cuthbert William Johnson - 1842 - 1364 pages
...it, for instance, 400 grains, must be neated red for half an hour in a crucible, mixed with one third of powdered charcoal. The mixture must be boiled for...pint of water, and the fluid collected through the filtre and exposed for some days to the atmosphere in an open vessel. If any notable quantity of sulphate... | |
 | Cuthbert William Johnson - 1844 - 1210 pages
...and when salts contain nitric acid, they produce scintillations by being thrown upon burning coals. 9. Should sulphate or phosphate of lime be suspected...heated red for half an hour in a crucible, mixed with one third of powdered charcoal. The mixture must be boiled for a quarter of an hour in a half pint... | |
 | Cuthbert William Johnson - 1869 - 1296 pages
...and when salts contain nitric acid, they produce scintillations by being thrown upon burning coals. 9. Should sulphate or phosphate of lime be suspected...heated red for half an hour in a crucible, mixed with one third of powdered charcoal. The mixture must be boiled for a quarter of an hour in a half pint... | |
 | 1806 - 426 pages
...requires a particular C 2 process process upon it. A given weight of it, for instance four hundred grains, must be heated red for half an hour in a crucible, .mixed with one third of powdered charcoal. The mixture must be boiled for a quarter of an hour, in a halfpint... | |
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... and exposed for some days to the atmosphere in an open vessel. If any notable quantity of sulphate of lime (gypsum) existed in the soil, a white precipitate will gradually form in the fluid, and the weight of it will indicate the proportion. 
