1970 >> October  

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Research Division



From Richard Case:

I just recently obtained a few insulators I think could be fairly uncommon; that is, a CD 153 hoopskirt like the Hemingray 42, but without the drip points.  Dimensions are the same as the CD 153, it is embossed BROOKFIELD ...                    [more]


Power Insulators

   by Robert Winkler


I am taking this information from the Northern Indiana Public Service Company that serves our area. Although this is local information, I believe it generally holds true across the country.

At this time NIPSCO still has a large number of glass insulators in service mostly in the lower voltage distribution systems. However, about two years ago they began to stop using glass entirely, and all new lines and replacements are now using porcelain.
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Questions Answered by N.R. Woodward

   by N. R. Wooodward


In reply to: "When did Hemingray switch from pointed to round drip points?"

The modern-type hemispherical drip points were adopted as standard on all Hemingray insulators about 1923 or 1924. Just previous to this time, there was a period of several years when insulators were made with extremely long, sharp pointed drip points. These particular insulators are extremely hard to find in perfect shape, with all of the drip points intact. Still earlier, during the period 1893 to about 1918, the drip points varied considerably. As a general rule, they were sharp-pointed, but were short and not so easily broken. However, one sometimes finds these older Hemingray insulators with round drip points. This may be either because they were intended to be round, or because the glass failed to fill out the tips of the sharp points. As a result, one sometimes finds an insulator ...                    [more]


The E. I. V. French Insulator

   by Ira  G. Groff


One of the largest glass factories in Europe is the Saint-Gobain works at Saint-Yorre, France. Manufacturing everything from insulators to giant telescope mirrors, they have a reputation for quality glassware.

I was lucky enough, on a recent trip to Europe, to obtain some insulators made by their subsidiary, Sediver, which, as you can see from the illustration, stands for European Society for Glass ...                    [more]


The Handy Dandy (Amateur) Insulator Collector's Collecting Kit

   by Sue Curtis Ducro


In olden days it was always convenient to carry a beach bag in the car trunk so as to never be unprepared for a possible swim in suitable weather.  Beach bags, like the versatile scouting knapsack, may now be converted into Insulator's Readiness Bag.

...                    [more]

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