Fred Locke No. 316

Insulator for High Electrical Pressures.

High-Pressure Insulator.

The insulator illustrated herewith represents the type being supplied in large quantities to the Standard Electric Company in California by Mr. Fred M. Locke, Victor, N. Y. These insulators are for use on a line 200 miles long, carrying a pressure of 60,000 volts. The insulator is made of brown china with a glass or porcelain centre extending down around the pin. It is 10-1/2 ins. in diameter and about 15 ins. from the top of the cross-arm to the aluminum line wire. It weighs about 12 lbs, and was subjected to a standard salt water test of about 120,000 volts. The beveled trough on the periphery catches all the water shed from the upper surface, and spouts it off to one side of the arm. The surface leakage in wet weather is said to be not over one-eighth watt. The insulator is mounted on a wooden pin with a porcelain sleeve, as shown.