Hemingray has issued a booklet on insulators

With the Electrical Manufacturers

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The Hemingray Glass Company, Covington, Ky., has published a booklet entitled "Some Interesting Facts about Hemingray Glass Insulators." This booklet is worthy of a careful reading by everyone interested in the subject of line insulation whether for low voltages or for long-distance, high-tension transmission systems. It brings to light some very interesting information with regard to the relation of design, insulating properties, and the proper annealing of glassware in order to produce a perfect insulator. There is also an interesting description of methods of testing adopted by the Worcester Polytechnic Institute and a table of results, together with suggestions with regard to safe operating voltages for the various types of Hemingray insulators. Copies of this booklet will be furnished to those interested upon request.

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