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Insulator, Glass Hemingray Glass Manufacturing Corporation 1890

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suspension type insulators. powerline insulators glass insulator

In the case of the example in front of me, the “8” is followed by 7 dots, BUT the only difference getting a unique mold number/letter combo. The 10B is a mold number, serving to identify the exact iron mold used. On these particular insulators the mold number (or mold quantity/letter) is indeed on the REVERSE side, positioned underneath the “MADE IN U.S.A.” embossing. Regrettably, there is no way to date the aqua-colored Hemi-42s. As you probably realize , the “42” is a model number and gives no info at all concerning date of production. The “brass bushing” or “thimble” insert was place in location by machine, at the time the insulator was created and the glass was nevertheless very hot.

  • Throughout the rise of the electric telegraph and phone, they had been employed to establish the communication network by securing telephone poles and preventing present loss for the duration of transmission.
  • This is on the base of a little green glass jar, perhaps for an ointment.
  • In spite of getting so extensively readily available, the Hemingray-42 is nevertheless 1 of the most well-liked and most traded insulators ever produced.
  • Hunting along the best of the Hemingray office creating on Macedonia Ave.
  • And if all the insulators are in excellent condition, they will no doubt attract the interest of collectors wanting to expand their catalog.


Primarily based in Yreka, California, Macky can be reached through his internet site, Glassian, which is a member of our Hall of Fame. All that can be stated is that the aqua (turquoise or blue-green, as well as Hemingray Blue, and some are discovered in correct green) 42s date from 1921 to about 1930 or 1931. If it has sharp drip points, it likely dates from someplace in the 1921 to 1924 time period. If it has round drip points, it most likely dates sometime involving 1924 and 1930. Those dates are not “written in stone” but are as close to precise as collectors can be at this time. None of the aqua 42s have any form of production date codes on them.

Collections & Exhibitions



Basically, the “31” is a mold number, identifying the precise mold the insulator was made in, and the “52” is a date code indicating what year the MOLD ITSELF was produced . If there are any dots to the correct of the date code, add one particular year for every dot to arrive at the year the insulator was made. In your case because there are just two dots, that unique insulator was made in 1954.

hemingray glass insulators

The CD 127.4 and CD 131.four and CD 133 are probably the early created threaded insulators applying this patent (the CD 127.4 is shown in the patent application). Hemingray-42 is widespread across antique stores and auction internet sites like eBayand Etsy. Rare insulators may perhaps also go up for sale by means of private auction internet sites like Worthpoint.com. If having said that, an insulator is in very good situation, it will fetch a higher price at auction. Prevalent Hemingray-42 with no damage or marks can sell for $20 or moreat auction.

Please check out my webpage on Glass Insulators , plus there are gobs of webpages on the net exactly where insulators, both glass and porcelain, are discussed in extra detail. The “MASON’S PATENT NOV 30TH 1858” style jars were created for properly over 50 years by hundreds of glass firms. Not counting the new repro’s sold in the last couple of years, most of them coming from Asia…….China and India.

I definitely appreciate your site with all this facts. Any ideas you can provide on figuring out their worth would be tremendously appreciated. Though Hemingray blue is stunning, insulators in this popular colour will not fetch substantially. If you have a Hemingray-42 in a rarer color, such as deep green, it may well be worth significantly additional. Milk glass insulators are some of the most beneficial mainly because of their rarity.

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Soon after about 1933, the 42s had been largely becoming made in clear or off-clear glass, and by that time, date codes were coming into use. No, the “9” is a model number assigned to that unique type of insulator created by Hemingray Glass Corporation and does not indicate the year it was made. The number 9’s are “pony insulators”, smaller sized types made use of primarily on local, quick distance, low voltage phone lines. On older insulators, the wording is commonly “HEMINGRAY / NO. 9”, on additional recent examples the phrasing is usually “HEMINGRAY-9”. The numbers on the other side of the insulator (such as 31-52, as in your case) is a combination mold and date code.



But they are so well-known they are all snapped up instantly, everybody desires them. So high voltage insulator asked him about them and it turns out all the original insulator collectors have been linesmen. They’d go out and do a job and there’d be an old pole with antique insulators on them. They’d swap out the old ones with the new ones and to everybody else, the old had been just junk. So my neighbor knew a lot of other insulator collectors and it just went from there. There was a national insulator show in San Diego and even a single in my hometown.
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on Dec 12, 23