Electrical insulator pin, ca. 1917
Purchase a reproduction of this item on VintageMaineImages.com.
The pin is part of a type of electrical insulator -- a device that keeps electrical current from "leaking" out of lines.
The insulator with the pin (that screws into the base of the porcelain insulator) was patented in 1865.
If you'd like to privately share a comment with MMN staff, please use this form.