The Manufacture of Porcelain Insulators

Alfred Gradenwitz
1912 Scientific American  
PORCELAIN consists mainly of a mixture of kaolin, quartz, and felspar, in proportions variable to a high extent in accordance with the purpose it is intended for. For electrical applications hard porcelain, consisting of a kaolin core immersed in felspar and quartz paste, is used exclusively. This composition, which is burnt at a very high temperature, gives a very high mechanical and elec trical resistance, as required in electrical insulators. After being crushed and ground, the quartz and
more » ... , the quartz and felspar are thrown into troughs filled with water and fitted with Appearance Presented by an Insulator During a High tension Test. mechanically operated stirring devices, and are there mixed with kaolin previously freed from impurities. The liquid paste thus formed passes through fine copper wire A 50-kilowatt Transformer-250 to 250,000 Volts-oil the Testing Floor.
doi:10.1038/scientificamerican08031912-72supp fatcat:kzzmtcwpbjbe7j4gpuq2mwxox4