Insulator Profile:

CD 145 Hemingray-21
Copyright 2007. All rights reserved.

CD: 145
Manufacturer: Hemingray
Style Number: 21
Trade Name: Western Union Standard
Size: 3 1/4" W x 4 3/8" H
Weight: 16 oz.
Production Date: Late 1910's - 1940's
Usage: Telegraph
"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."

Common Variations:
Colors: Hemingray Blue, Aqua, and Clear
Bases: Smooth, Round or Sharp drip points
Embossings: (F-Skirt) HEMINGRAY (R-Skirt) No 21
(F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) No 21
(F-Skirt) HEMINGRAY-21 (R-Skirt) MADE IN U.S.A.
(Numbers and dots may appear below the embossing on either or both the front and the back)
If your insulator has "numbers and dots" on it, you can find out more about them
by reading this information about dating your insulator.
Uncommon Variations:
Colors: Darker Greens

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