Three years ago I bought a collection from an eighty two year old collector. In the collection was an insulator that I had never seen. I asked the old collector where he obtained the piece. After a stare into space and some prolonged thought he said that he could not remember. Suggestions relative to its use would be appreciated.

The insulator is solid glass molded around a 9/16" brass rod that is threaded down the rod from the tip for 3/4". The threads seem to be American Standard coarse 13 threads per inch. The rod protrudes out from the top of the insulator for 1-3/16" . Near the bottom of the rod, inside of the insulator, is a smaller rod that passes through it forming a "T". I believe the "T" was to prevent the rod from turning in the glass when something was tightened on the threaded end. The insulator measures 3" across the base and is 3-3/4" tall. The flat top of the insulator measures 2". The wire groove is 1/4". The glass is an ice aqua with a few small amber streaks.

Looking at the picture you will notice an apparent flash over coming down from the wire groove on the right side. The wire groove shows evidence of use and also has chips in several places along the wire groove ridges. The insulator is poured in a three piece mold. Two mold lines extend up the sides of the insulator culminating in the center of the wire groove ridge above the wire groove. The other mold line circles the upper wire groove ridge.