The earliest of these probably are the N o 8 CD 112.4 and the N o 9 CD 106. 1910 CD 152 is developed as a new standard for telegraph work. 1922 CD 154 is developed as a replacement for CD 152 for telegraph work. The color is not actually crystal clear but ice blue. Owens-Illinois buys the Hemingray Glass Company.
Production remains at the Muncie, Indiana plant.
Hemingray produces true clear insulators. A true clear glass is needed for the production of glass building blocks, and this glass is used for insulator production also. 1940's During the war years, several styles are designed to use less glass. The Hemingray plant is shut down and insulator production ceases. If you have questions or comments, please use this Feedback Form .