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" ... to the first 16 ft. ; an increase to 15 per cent will be sufficient, however, to heat a second hearth, while a 20 per cent sulphur-ore will work rapidly in a three-hearth furnace. The addition of a fourth hearth is rendered justifiable by the increase... "
Modern American Methods of Copper Smelting - Page 137
by Edward Dyer Peters - 1887 - 342 pages
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Modern Mechanism: Exhibiting the Latest Progress in Machines, Motors, and ...

Park Benjamin - Machinery - 1892 - 970 pages
...'fourth hearth is rendered justifiable by the increase of the average sulphur contents to 25 per cent. As there seems to be almost no limit to the extent...obtained in the calcination of highly sulphureted ores, much longer furnaces have been used, 120 ft. being the extreme inside limit. The width of the furnace...
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Modern Mechanism: Exhibiting the Latest Progress in Machines, Motors, and ...

Park Benjamin - Machinery - 1892 - 962 pages
...fourth hearth is rendered justifiable by the increase of the average sulphur contents to 25 per cent. As there seems to be almost no limit to the extent...obtained in the calcination of highly sulphureted ore?, much longer furnaces have been used, 120 ft. being the extreme inside limit. The width of the...
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Modern Copper Smelting

Edward Dyer Peters - Copper - 1898 - 742 pages
...lastly, a decided economy in construction, the ratio of fire-brick to common red brick for an eqnal capacity of plant being much less in the employment...still longer furnaces than any yet mentioned, 120 feot being the extreme inside length yet attempted, so far as known to the writer; bat careful and...
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Modern Mechanism: A Practical Treatise on Machines, Motors, and ..., Volume 3

Park Benjamin - Mechanical engineering - 1904 - 1578 pages
...fourth hearth is rendered justifiable by the increase of the average sulphur contents to 25 per cent. As there seems to be almost no limit to the extent...obtained in the calcination of highly sulphureted ores, much longer furnaces have been used, 120 ft. being the extreme inside limit. The width of the furnace...
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