National Electric Porcelain Co. offers new knob

[Trade Journal]

Publication: Electrical Record

New York, NY, United States
vol. 14, no. 2, p. 37, col. 2

National Insulator for Knob and Tube Work


This device, designed by a practical electrician with a view to convenience, is made by the National Electric Porcelain Co., of Carey, Ohio. As shown in the illustration, the projections on the bottom bite into the wood, thus preventing it from turning and letting the wire become slack.


This illustration has not been processed yet.


The screw is started just enough to bring the dowel points into registration with their sockets. The wire is then placed in the gorrve, and slight twist with the pliers against the flat side of the insulator draws the wire taut. Then the screw is tightened down. The long dowel points prevent any turning of the top piece on the bottom piece. This device is also used for splicing, both grooves being used and all strain taken off the wire at the splice.


Keywords:National Electric Porcelain Company
Researcher notes: 
Supplemental information: 
Researcher:Elton Gish
Date completed:January 21, 2014 by: Elton Gish;