Thomas high potential insulator

[Trade Journal]

Publication: Electrical World

New York, NY, United States
vol. XXVI, no. 4, p. 117, col. 1

A High Potential Insulator

The accompanying engraving shows an extra heavy, double petticoat china insulator designed for use on lines carrying unusually high potentials. This insulator is manufactured by Fred. M. Locke, Victor, N. Y., and is made of the very finest grade of china obtainable. It is thoroughly glazed, and the maker claims it will handle a 25,000-volt circuit with absolute satisfaction. The insulator is five and one half inches in diameter at the bottom, and is provided with a groove across the top, in addition to the regulation groove around the body.

 

SPECIAL CHINA INSULATOR.
Special China Insulator.

 

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Keywords:Fred Locke : R. Thomas & Sons Company : Patent : U-923B : U-923C
Researcher notes:This is the first porcelain insulator designed by Fred Locke. It is U-923B and U-923C made of dry process porcelain by R. Thomas & Sons Co. It has a cross-top. The first insulators of this type did not have any embossing or manufacturer's markings. Shortly thereafter Fred Locke had the mold altered so that the patent dates for his two patents were embossed (raised lettering) in the bottom of the cross-top grooves. Note that neither patent covered the insulator except for the claim of the petticoats in the first patent.
Supplemental information: Patents: 402,752; 520,367
Researcher:Elton Gish
Date completed:June 3, 2005 by: Elton Gish;