HEMINGRAY - 42 AMERICAN GLASS INSULATOR 4" LED NIGHTLIGHT Glass telephone insulators were invented to support telephone wires, preventing interference and ensuring clear communication by keeping the wires insulated from the supporting poles. Manufactured from the mid 1850's to the mid 1950's, glass insulators provide a glimpse into Americas telecommunications history. In 1936, President Roosevelt passed the Rural Electrification Act, which provided funding for rural areas to gain access to…