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Updated: April 30, 2025
They noted, however, that the remains of calcination weighed more than the original product, and the natural inference from this would be that the metal must have taken in some substance rather than have given off anything.
This stone is generally found among the bituminous schistus, or black argillaceous strata, either in separate masses of various shapes and sizes, or forming of itself strata which are more or less continuous in their direction among the schistous or argillaceous beds. This mineral contains, in general, from 40 to 50 per cent. of iron, and it loses near one third of its weight in calcination.
The advantages of the steam process, as compared to the old six-ton Pattinson pots formerly used by the writer's firm, are: a saving of two-thirds amount of fuel used; the saving of cost of calcination of the lead to the extent of at least four-fifths of all that is used; above all, a saving in labor to the extent of two-thirds.
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