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The National Insulator Association NIA is an organization of collectors and friends interested in electrical insulators and other artifacts connected with the many industries associated with electrical power, such as telephone, telegraph, railroad, power distribution and lightning protection devices. As such, most donations to the NIA are tax deductible. In the first year of its operation, more than charter members joined its ranks. Since then, annual paid membership has reached a high of more than 1, members. Residents from each of the states of the United States and the provinces of Canada have become NIA members, as well as from many foreign nations.

Insulator hunting along old railroad

Patent of the Day. Stewart, Jr.

The material, glass, is itself an insulator (not a "conductor" or "transformer" as insulators are often incorrectly labeled in antique malls and flea markets). ADVERTISEMENT Both glass and porcelain insulators have been used since the early days of the telegraph, but glass insulators were generally less expensive than porcelain, and. Glass Insulators were first produced in the 's for use with telegraph lines. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. In the mid 's a few people began collecting these glass and porcelain insulators. Today there are over collectors, and insulator clubs, national shows, and good reference books are available. CD telephone insulator, marked BROOKFIELD (this is the same style/shape as the "HEMINGRAY" made by Hemingray Glass Company) Brookfield made insulators for various utility companies, (telephone companies, railroads, electric power companies) and some of these are found with embossed initials / names on them, such as A. T. & T. Co., G.E. Co., C. D. & P. Tel. Co., etc.

Third Rail: U-shaped third rail insulator metal caps fitting over each part to support rails. Chelsea, MI. Johnston, IA.

Threadless Glass: Worldwide Glass: US Porcelain: Worldwide Porcelain: Click on an insulator above for more information! Link to other types of insulators. Return to the National Insulator Association page. Insulators: The National Insulator Association (NIA) is an international organization of collectors and friends interested in electrical insulators, and other artifacts connected with the many industries associated with electrical power, telephone, telegraph, railroads and/or lightning protection devices. Porcelain has a dielectric strength of about kV/mm. Glass has a higher dielectric strength, but it attracts condensation and the thick irregular shapes needed for insulators are difficult to cast without internal strains. Some insulator manufacturers stopped making glass insulators in the late s, switching to ceramic materials.

Waukesha, WI. Garland, TX.

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Manchester, CT. Elkton, MD. Springfield, OH. Bethlehem, PA.

Farmington, NM. ated Sunday June 14, Why don't you join? Generally, these were neatly aligned in two rows after the year code, looking like a row of colons.

Dating Hemingray Insulators Decoding the date codes. Writen by Bill Meier. All Hemingray insulators since have had mold and date codes on them. In the Price Guide, these are generally referred to as [Numbers and dots] and [Number]. There are several different .

But, a colon is really two dots. In some cases the dots are around, above, and below the "-" dash. In any case, count ALL the dots, and add this to the mold year see above.

ANTIQUE GLASS INSULATOR MAYDWELL - 20 USA MILK WHITE OPAQUE electric maydell. $ Free shipping. Make Offer - ANTIQUE GLASS INSULATOR MAYDWELL - 20 USA MILK WHITE OPAQUE electric maydell. Antique Glass Insulator Brookfield + 4 Other Insulators Used. $ 6d 10h +$ shipping. Glass Insulator Lamp with LED bulb for desk or nightlight in wide. $ 7 left. Telephone pole glass insulators. $ 1 sold. Sponsored Listings. 10 INCH GREEN GLASS SUSPENSION BELL INSULATOR MINT CONDITION. $ Hemingray Glass Insulator No. 42 Clear. $ Glass insulators' heyday was the ss or so, and not much beyond, so there isn't a lot of glass still in the air, if that's the kind of hunt you mean. What glass remains will usually be found along RR right of ways. In my little town, only a single pole still has glass on it; .

This gives the date the insulator was actually produced. The mode code is a one or two digit number, sometimes followed by a letter.

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In some cases, the letter designated the type of material the mode was made out of. Generally, the mold code is not significant, unless you really are a specialty collector. Dots will likely follow the "numbers".


All dots around the year code should be counted a colon counts as two dotsand added to the date of mold manufacture.

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    2 Replies to “Glass insulator dating”

    1. Between us speaking, in my opinion, it is obvious. I recommend to look for the answer to your question in google.com

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