Fred Locke M-2795 Used on the Standard Electric Company Line in California

A Line Insulator for 60,000 Volts

The increasing use of polyphase currents for power distribution by electric railway companies makes all improvements in this branch of electrical work extremely interesting. For this reason the engraving of an insulator to be used on a 60,000-volt transmission line 200 miles long, being built by the Standard Electric Company, of California, is shown herewith.

Insulator for 60,000 Volts.

The insulators, which are being made by F. M. Locke, of Victor, N. Y., are brown china, with either a glass or porcelain center extending down around the pin. Each insulator is 10-1/2 ins. in diameter and about 15 ins. from top of cross arm to the aluminum line wire. It weighs about 12 lbs. and has a standard salt water test of 120,000 volts. The evetrough [sic] eave trough on the periphery catches all the water from the upper surface, and spouts it off to one side of the line. The surface leakage in wet weather is not over 1/8 watt. The insulator is mounted on a wooden pin with porcelain sleeve as shown.