Publication: The American Telephone Journal
New York, NY, United States
A NEW TYPE OF TREE INSULATOR.
IN stringing telephone lines recourse is often had to trees for support. In general practise it is customary to use either brackets or knobs, with the latter the suspension being by means of wires attached to the limbs, which are so arranged as to allow a flexible movement. Both these methods have their disadvantages, inasmuch as the extent of the movement of the tree, due to the action of the wind cannot be compensated for without allowing too much slack. To overcome this difficulty Dunton & Field, 117 Main street, Cambridge, Mass., have devised an attachment having universal bearings, upon which is mounted an insulator. Its construction readily permits it to be attached to the limbs or branches of a tree at any angle or position. The manufacturers claim that it is the only one that allows the wire to be tied in solid to the glass without injury to the wire or tree. It can be used on any size of wire, is made of malleable iron of the best grade. The glass is screwed on an ordinary locust pin entirely protected 'from the weather. This insulator will be found of great benefit in construction of rural and long service lines, as it does away with the setting of poles if trees are available for supports. A leaflet giving further particulars respecting this device will be sent upon request.
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|Keywords:||Dunton & Field : Tree Insulator|
|Date completed:||September 18, 2011 by: Elton Gish;|