Hemingray has issued a pamhlet on insulators

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THE HEMINGRAY GLASS CO., Covington, Ky., has recently published a booklet, which contains valuable and interesting information regarding glass insulators that has not previously been widely circulated. Proper annealing is dealt with and this is given as the prime reason for the uniform success of the Hemingray insulator.

Tests made by Professor Albert S. Richey and Francis J. Adams of the Worcester, Mass., Polytechnic Institute, using different types of insulators, are described and the average flashover voltage of each type is given in tables. These tests indicate that the Hemingray insulators all have a much greater factor of safety above the voltages which they will be called upon to carry, than engineer might specify. This booklet can be had upon request.