|Trade Name:||Western Union Standard|
|Size:||3 1/4" W x 4 3/8" H|
|Production Date:||Late 1910's - 1940's|
|"This insulator replaced the old Compromise
insulator which was an accepted telegraph standard. Probably ten million compromise
insulators were in service in the years 1865-1881."
"By 1881, glass-making had progressed to a point where an economical double petticoat was possible, and the Hemingray No. 21 was the result. This insulator, also known as the "Standard DP" or "Western Union Standard" was widely used down to about 1900 and still is in limited use."
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