Dunton & Field exhibited their Dunton tree insulator at Boston International Electrical Exhibition

Dunton & Field, of Cambridge, Mass., exhibited a tree insulator of novel design, so constructed that it can be used with any size of wire. It consists of a malleable-iron arm with a cone-shaped casting pivoted to its lower end. A standard locust pin is driven into the casting and the insulator is mounted upon this. The malleable-iron arm swings on a sleeve which is lag-screwed to the limb of the tree. The insulator consequently allows the limb of the tree to move in any direction without injury to the tree or wire; there is no place on a tree where the insulator cannot be attached, and the wire insulation is protected from wear.