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Updated: June 17, 2025
The application of electricity to metallurgical processes has hitherto been confined to the reduction of metals from solutions, and few attempts have been made to effect dry reductions by means of an electric current. Sir W. Siemens attempted to utilize the intense heat of an electric arc for this purpose, but accomplished little beyond fusing several pounds of steel.
With the exception of Waldhaus, who belonged to one of the noble families of the neighborhood, they were all Jews and all very rich: Mannheim was the son of a banker: Mai the son of the manager of a metallurgical establishment: and Ehrenfeld's father was a great jeweler.
The incineration and fusion of the materials of which the vitrified forts are made, especially the granite ones of La Creuse and the Cotes du Nord, bear witness, says Daubree, to a surprising skill and knowledge of the management of fire in those who burned them, but these qualities were manifested also in extremely ancient metallurgical operations.
As described in their patents, the Cowles process consists essentially in the use for metallurgical purposes of a body of granular material of high resistance or low conductivity interposed within the circuit in such a manner as to form a continuous and unbroken part of the same, which granular body, by reason of its resistance, is made incandescent, and generates all the heat required.
In general the whole industrial life of our day is being slowly explored in the quest of new educational elements; and rubber, lead, glass, textiles, metallurgical operations, agriculture, every tool and many machines, etc., are sure to contribute their choicest pedagogical factors to the final result.
Phenomenon almost incredible though distinctly seen, what did he then behold but his own metallurgical Louisa, peeping with all her might through a hole in a deal board, and his own mathematical Thomas abasing himself on the ground to catch but a hoof of the graceful equestrian Tyrolean flower-act! Dumb with amazement, Mr.
"All very fine," say our bogey men, our prophets of impending evil; "but blue china has gone to the wall, autographs are losing caste, old books and first editions are on the downgrade, pipes are relegated to the lumber-room, metallurgical cabinets are coated with dust, and even walking-sticks survive only at Sandringham!" Just so.
In the list of Edison's patents at the end of this work may be noted many other of his miscellaneous inventions, covering items such as preserving fruit in vacuo, making plate-glass, drawing wire, and metallurgical processes for treatment of nickel, gold, and copper ores; but to mention these inventions separately would trespass too much on our limited space here.
Many states and nations, and many world-famous mining companies are represented by exhibits of ores and metals, of mine models, and mining and metallurgical processes in operation. California shows a gold dredger and a hydraulic mine in operation. The great copper mines of California, Montana, Utah, and Japan, have installed significant exhibits.
"Who is this gentleman that we ought to be able to hire?" I asked. "He is the best, or at least one of the best, metallurgical chemists in the district, and it goes without saying that an honest assayer counts for everything in this mining game. Without one, the smelters will skin you alive." I laughed. "I didn't ask what he was; I asked who he was or is."
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