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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.

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Join The NIA. Printed Hobby Directory. Insulator Identification Gallery.

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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. Insulators embossed with a 5-pointed star were made by various manufacturers under contract with General Electric. They were made in large numbers, so most are not too rare or valuable, but they do come in nice colors (within a limited palette of mostly aquas and greens), so a star collection is an affordable way to get started collecting. 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].

Basic Information on the NIA 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.

Objectives and Purpose The NIA, as stated in its By-Laws, is a non-profit educational and scientific organization; its aim is to encourage insulator collecting and to protect the interests of its members and collectors, and has established standards and ethics by which its members may fairly deal with each other.

Dating insulators

Membership Information Any person interested in insulators, lightning rod equipment or a related collecting or historical activity shall be eligible to apply for membership. Thermal insulating materials include fibreglass, cork, and rock wool, a mineral wool that is produced by blowing a jet of steam through molten siliceous rock or limestone or through slag.

These and other substances of low thermal conductivity retard the rate of heat flow.

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They break up the heat-flow path by their opacity to radiant heat and by interposing numerous air spaces. Thermal conductivity is usually not constant for any given material but varies with temperature. Conductivity decreases with increasing temperature in most metals and other crystalline solids, but it increases in amorphous substances such as glass.

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High-Voltage Test for Insulators

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The way that atoms bond together affects the electrical properties of the materials they form. For example, in materials held together by Get exclusive access to content from our First Edition with your subscription.

Some information is questionable or incomplete, and I will ate this webpage as I learn more.

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For a listing of some primary embossings found on glass insulators, and the glass factories that may have produced them, click here. In addition, recent evidence has surfaced which proves that the Lyndeborough Glass Company, South Lyndeborough, New Hampshireproduced many of the American Insulator Company-embossed insulators. There is a possibility this was one of the factory locations where some of the American Insulator Company insulators were produced besides the Lyndeboro Glass Company, see that entry.

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They are believed to have manufactured some insulators in the ss period, including CD For more information on this prolific glass company, please click here.

Several scarce and unusual styles of insulators were evidently made there, none of them marked. Click here for more info on the California Glass Insulator Company.

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Johns, Canada East Quebec Type s are unknown. The great majority of glass Pyrex insulators for the U. A tremendous variety of industrial glass as well as glassware for home use has been produced by this company for well over a century. In the name was changed to Diamond Flint Glass Co.

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Most insulators made by Dominion were produced at the Wallaceburg site. Insulators were also made for short periods of time at Redcliff, Alberta and at Point St. Charles, Quebec The last insulators made by Dominion are reported to have been produced inalthough production of other glass items bottles, lamp chimneys, etc continued afterward.

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The company became known as Domglas after about According to information uncovered by researcher Bob Stahr, the actual source of these insulators was the above-mentioned firm, located in Carnegie, PA, now a part of metropolitan Pittsburgh. The Duquesne Glass Company was incorporated in January ofand was in operation for approximately two years.

The glass was manufactured at a plant owned by the H. Dixon Company.

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Another glass factory with the same name i. Duquesne Glass Company was located in Paden City, West Virginia, and was in business from about some sources state to c. That operation was principally a bottle house, and did not produce insulators. Fry Glass Company Rochester, PA Fry Glass made at least 5 different types of glass insulators that are known so far 4 pintypes and all are unique styles and very rare.

Most known examples were recovered from the factory dumpsite.

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Colors included opaque cobalt blue, milky opalescent, dark purple blackglass, etc. The actual manufacture of these insulators occurred in the s.

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. (For a general overview about glass electrical insulators, please check out my webpage here.) On this webpage I've compiled a list of glass insulator manufacturers - factories that made (or are believed to have produced) glass electrical insulators. Although primarily listing factories that were located here in the United States of America, I'm also including a few Canadian and Mexican. Electrical insulators are used to hold conductors in position, separating them from one another and from surrounding structures. They form a barrier between energized parts of an electric circuit and confine the flow of current to wires or other conducting paths as desired. The insulation of electrical circuits is a necessary requirement for.

Insulators were evidently only produced during the period of to Their main line of glass products consisted of various kinds of bottles and fruit jars. Good Jr. See Valverde Glass Works.

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Ending date of insulator production at Harloe is uncertain but evidently in the period. Glass insulators were made from at least as early asup to The Hemingray plant at Muncie under Owens-Ilinois ownership closed permanently in Only one example has been found to date, in a shade of light green, and it was purchased at a flea market in the Houston area.



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