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Message to readers about contents for this month....



Foreign Insulators

   by Marilyn Albers


The New Foreign Glass Chart

Two and a half years ago, when this column first appeared, we were just beginning to get our feet wet doing research on foreign insulators. And now I'm so happy to be able to tell you that, as of this writing, there is a brand new design chart available to you, complete with ...                    [more]


Porcelain Insulator News

   by Jack H. Tod, NIA #13


Dear Jack:

I have a U-293, baby-blue glaze, and with an underglaze G-P marking (cobalt blue ink). You don't show this marking in the second edition of your Porcelain Insulators Guide Book. Any ideas an who made this insulator?                                                        

...                    [more]


Patents On Glass Insulators

   by Jack H. Tod, NIA #13


I used the book "Electrical Porcelain" as a vehicle to publish essentially my entire patent file, nearly 700 of the most important 1880-1962 insulator patents from the several thousand I recorded in my patent search work in the early 1970's. The listing includes a number of previously unknown or unpublished patents on specific glass ...                    [more]

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