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Updated: June 20, 2025
Some part of it, as the breathing and oxidisation business, he is well up to, inasmuch as they form part of previous roles, but the teeth and hair, the upright position, the power of speech, though all tolerably familiar, give him more trouble for he is very stupid a regular dunce in fact.
When zinc amalgam is used, alkalies would, of course, be detrimental. When no other water than that from the mine is available, difficulties often arise owing to the impurities it contains. These are various, but among the most common are the soluble sulphates, and sometimes free sulphuric acid evolved by the oxidisation of metallic sulphides.
The firing is provided from outside, the inventor maintaining that the products of combustion are inimical to rapid oxidisation, to specially promote which he introduces an excess of oxygen produced in a small retort set in the roof of the furnace and fed from time to time with small quantities of nitrate of soda and sulphuric acid. Ores containing much sulphur virtually calcine themselves.
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