Fred Locke glass suspension insulators

Insulating Composition Material

An insulating material containing boron, which is called "boro-porcelain," is being made by Fred M. Locke, Victor, N. Y. With this material a low dielectric constant and high dielectric and mechanical strength are obtained and the coefficient of expansion is almost as low, it is declared, as fused silica. According to the manufacturer, the voltage required to arc over the surface of an insulator made of this material is 20 per cent to 30 per cent more than for one of high-grade porcelain, and the dielectric strength is 50 per cent greater than that of porcelain. It is especially adapted for use with high-voltage transmission lines.

Insulator of "Boro-Porcelain"