Fred Locke Insulators

[Trade Journal]

Publication: The Electrical Engineer

New York, NY, United States
vol. 23, no. 455, p. 94, col. 1





THE introduction of high potential currents for long distance transmissiion has called for improved types of insulators capable of withstanding pressures of 30,000 volts and over, and Mr. Fred M. Locke, of Victor, N. Y., as mentioned by us on Jan. 6, has recently brought out several types of insulators specially designed for this class of work. Our illustrations represent these various types. Their characteristic feature consists in the fact that they are made in two parts, the inner part of porcelain or glass, which are screwed together. By this construction it is claimed that the resistance to puncture is greatly increased, while at the same time the thickness of the two parts may be decreased, thus making the insulation lighter. In the accompanying illustrations the group, Fig. 1, at the left shows the parts of the insulator designed for 30,000 volts. Each part alone can stand 50,000 volts without puncture. The insulator is mounted on a locust pin boiled in paraffine oil and provided with the Locke steel pin which passes through the cross-arm.

The group, Fig. 2, shows an insulator of the same type with a specially wide outer petticoat.


Locke Insulators for High Potential Alternate Current Transmission.


Fig. 3 shows another group of insulators made by Mr. Locke, that at the left being the type used at Niagara Falls and de-equipments for 30 double-truck motor cars for the Oberschle designed to carry 22,000 volts. These insulators have withstood potentials up to 70,000 volts without breaking down.


Keywords:Fred Locke : U-937 : U-925 : U-940
Researcher notes:The three figures have been combineed and is backwards to the description in the text. Figure 1 is on the right. The Niagara insulator (far left in combined photo) is U-937 made by Imperial Porcelain Works. Note the ink stamp markings: FRED M. LOCKE / VICTOR, N.Y. The marking was evidently applied over the glaze just for the photo. From left to right in the combined photo: U-937, U-925, U-940,
Supplemental information: 
Researcher:Elton Gish
Date completed:September 22, 2009 by: Elton Gish;