Hemingray-40 Aqua-Green Vintage Glass Insulator
The Hemingray №40 was a very common and popular style, and was mass produced in aqua and green colors. In c.1910, an experiment with AT&T to produce a new standard insulator resulted in this design being selected. It was produced in mass quantities until 1921, when the Hemingray №40 was replaced by the extremely popular Hemingray - 42 (CD 154).
Note: The insulators a free of any major cracks but might have some minor nicks/chips.
Insulator diameter: 3.5 inches
Glass insulators were first produced in the 1850's for use with telegraph lines. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. In the mid 1960's a few people began collecting these antique glass insulators. Today there are over 3,000 insulator collectors.
All glass pintype insulators are classified in what is called the “CD Numbering” system of identification. This system was created and used by N.R. “Woody” Woodward, an early pioneer, researcher and author in the field of collecting glass insulators. The CD (Consolidated Design) numbers basically identify insulators by their shape and profile, regardless of exact embossed markings, glass color, or base type.