Pintype electric insulator, ca. 1916
Click on the image to zoom. Click and drag your mouse over the image to move it left or right. Use the small navigation window to select the area you wish to zoom on.
Purchase a reproduction of this item on VintageMaineImages.com.
The "pintype" insulator, with a socket in the base that screws on to a threaded wooden or metal "pin" mounted on the utility pole, was patented in 1865.
Earlier insulators were secured to the pins by various means (padding with burlap, or perhaps sticking down with tar).
Insulators keep the current in the grid and prevent it from "leaking" where it would be wasted or creating a hazard.
Please post your comment below to share with others. If you'd like to privately share a comment or correction with MMN staff, please use this form.