Dunton & Field has new literature about their tree insulator

DUNTON & FIELD, 117 Main street, Cambridge, Mass., have some new literature describing and illustrating the Dunton tree insulator. This insulator can be used on any electric lighting, telephone, telegraph, railroad or fire-alarm wire running through trees. The metal part of the insulator is of malleable iron, and the arm swings on a sleeve which is lag-screwed to the limb of a tree and turns in a cone-shaped casting pivoted to the lower end of the arm. This allows the glass to be placed in a vertical position at all times when tied to the wire.