Imperial Porcleain makes porcelain for electrical use

Trade and Industrial Notes.

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IMPERIAL PORCELAIN. — For high-tension electrical transmission it has been found that porcelain makes the only satisfactory line insulator. However, the ordinary porcelain will not serve for this purpose at all. Porcelain used for other than electrical purposes consists of a porous, absorptive material, covered with a white, smooth glazed surface. If the insulators are made of this, the surface skin gives high insulating properties, but the slightest flaw or crevice in this skin will allow the high-tension current to reach the interior, which being absorptive, is more or less moist, and carries the current to the pin. It is absolutely necessary for high-potential work to have insulators that are glazed or vitrified through their entire mass. Such porcelain is made by the Imperial Porcelain Works, of Trenton, N. J. A broken piece of their insulators shows its homogeneous nature, and a test of red ink shows its nonabsorptive qualities.

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