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CD 109 - Insulator of the Week on Wed, 21 May 2008


Chicago teardrop pony

Related Patents

Utility Patent 286,801 issued to Bradley Fiske & Samuel Mott on October 16, 1883


Embossing: (Base Rim) Chicago Insulating Co. Pat. Oct. 16, 1883

Colors: Usually just a standard aqua. Some have been found with a good degree of milk inclusions.


Patented by Fiske & Mott in 1883. The primary selling point of this design involved the wire groove. There was minimal contact with the wire due to the narrow raised ribs between the cutout patterns. This was touted as a means for providing better insulating qualities. In addition, Fiske & Mott also incorporated a second feature that involved the lack of projections above the body of the insulator at the wire groove. Insulators of that time period with raised projections at the wire groove, (such as the CD 130.1 Cal Electric Works) were evidently known for their susceptibility to damage, both before and during use. The "streamline" design of the CD 109, having no projections, was an equally important selling point. Both of these features are also found on the considerably more common Chicago CD 135s.

These brief comments on the Insulator of the Week are not intended to be complete and are presented to encourage discussion and additional information from ICON. Now it's your turn to share info and/or post photos of your favorite CD 109!





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