The maps of our large mines are usually prepared with the greatest care; and it is somewhat singular that, in comparison with the great amount
The equipment of a laboratory in which students are to be trained for practical work in metallurgical chemistry presents many difficulties not encountered in the
The work of a chemist at a busy smelting-plant differs radically from the work of a student, who takes all possible care to have his
The increasing demand for greater speed and more accuracy, in making daily assays of ores and products from mills treating material containing but very small
One of the properties of copper, which has done much to give it its present prominent place among the useful metals, is its electrical conductivity,—a
When dry chlorine gas is made to act in the cold upon finely- divided gold, it converts the latter with evolution of heat into auro-auric
I tested an ore, which was peculiarly difficult to treat, on several concentrators then in general use, including the Frue-vanner, the Luhrig table and the
Attempts to discover, for the cyanide process, a better precipitant than zinc have been unsuccessful. Hydrogen sulphide, sulphurous acid, ferrous sulphate, etc., precipitate gold and
“At-a-glance” corrosion chart for sulfuric acid is based on an extensive survey of construction materials; gives rough indication of suitable alloys. A variety of methods
In refining copper, the metal is melted down in a reverberatory furnace in a more or less oxidizing atmosphere and then further subjected to an