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The difficulty is that the binding material gives way, and the carborundum is slowly thrown off after some time.
When the powder is used I have found it best to proceed as follows: I make a thick paint of carborundum and tar, and pass a lamp filament through the paint. Taking then most of the paint off by rubbing the filament against a piece of chamois leather, I hold it over a hot plate until the tar evaporates and the coating becomes firm.
It would afford him a good chance to make his proposal while she was getting the fish ready for shipment. Some time after Gregory had left the cannery, Barnes reported he was out of carborundum and McCoy set out at once for Legonia. "They'd be all day sending it up," he said. "I've got to go down anyway and check over some stuff for us at the freight-house so it might as well be now."
This turning should be in the same direction for several revolutions, then in the opposite direction for several more revolutions, etc. As the abrasive becomes finer during the grinding, a little more may be added if necessary. In general, only a little grinding will be required, and one small pinch of carborundum or emery will be ample.
If we have a President, let him sing like McAdoo, or like Luther Burbank, or like Theodore N. Vail, or like Colonel Goethals, picking up a little isthmus like Panama, a string between two continents, playing on it as if it were a harp; or like Edward Ripley playing with the Santa Fé Railroad for all the world like Homer with a lute, all his seven thousand men, all his workmen, all their wives and their children, all the cities along the line striking up and joining in the chorus or like Carborundum Acheson, backed up by his little Niagara Falls oiling the wheels of a world, weaving diamonds into steel, hardening the bones of the earth into skyscrapers, into railroads, into the mighty thighs of flying locomotives....
It was in that year that H. Y. Castner of New York and C. M. Hall of Pittsburgh both invented the methods of manufacture which gave to the world the new metal, malleable and ductile, exceedingly light, and capable of a thousand uses. Carborundum is another product of the electric furnace. It was the invention of Edward B. Acheson, a graduate of the Edison laboratories.
It was of sorapus wood. The floor, ceiling and walls were of carborundum aluminum, a light, impenetrable composition extensively utilized in the construction of Martian fighting ships. As I had sat meditating upon the future my eyes had been riveted upon the port-hole which was just level with them as I sat. Suddenly I looked toward Phaidor.
One of the earliest notable uses of the electric furnace in a large electro-chemical industry was for the production of carborundum, a carbide of silicon, which is remarkably useful as an abrasive, being available in the manufacture of grinding stones and other like purposes to replace emery and corundum.
Acheson, of Pittsburg, while so engaged, and in obtaining graphite from coal by the heat of an electric furnace, discovered that combination of silicon and carbon now known as carborundum, which has commercial value as an abrasive." "I know about that," bowed Nick.
A capital method of thus bedding the dummy rings is to grind them down with a flour of emery or carborundum, while the turbine spindle is slowly revolving under steam. Under these conditions the operation is performed under a high temperature, and any slight permanent warp the rings may take is thus accounted for.
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