New Fred Locke "Combination" Insulator for high voltage lines.

New Insulators for High Voltage Lines.

A new insulator which is herewith illustrated has just been brought out by Fred M. Locke. It is made of porcelain with separate center insulating attachment, which may be made of either glass or porcelain. Its construction is both mechanically and electrically strong throughout, suitable for carrying high potential currents, having shown remarkably good results in transmitting large currents for long distances at a pressure of 15,000 volts. At a recent test these insulators on Mr. Locke's steel pins carried 70,000 volts for four hours, without heating, arcing or breaking down, which is an unusually good record. This test showed conclusively that this combination of glass and porcelain offers a very high resistance to puncture and surface leakage.

High Voltage Insualtor.

These insulators have over twelve inches of surface between the wire contact and the supporting pin. About ten inches of this surface is on the under side of the insulators out of reach of direct rainfall, where it keeps comparatively dry. The surfaces of the bottom of the insulators are perpendicular and therefore catch no foreign matter. Locke's patent steel insulating pin, the top of which is made of locust wood boiled in paraffine, is designed to be used with these insulators.