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-Early 1920's to 1960's, Original glass insulators, not reproductions.-A... HEMI BLUE HGCO!!! - CD145 HG CO [020] in Hemingray Blue Antique Glass Insulator. $2.00. 0 bids. Up for Auction is an incredibly beautiful Hemingray Blue HG CO Beehive insulator. It is a CD145 HG CO [020] in Hemingray Blue.


Glass Insulators were first produced in the 1850's for use with telegraph lines. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. In the mid 1960's a few people began collecting these glass and porcelain insulators. Today there are over 2000 collectors, and insulator clubs, national shows, and good reference books are availab...


If you are considering the purchase of an expensive insulator it may be a good idea to have an experienced collector take a look and give an opinion on its value. Glass Insulator Value Old glass insulators can range in value from $2 up to over $400.


Vintage Glass Insulators. Related Categories. Auction Alerts. Insulators were originally designed to keep the wires linking telegraphs and telephones insulated from the wooden poles that held them aloft. In conjunction with the expansion of rural electrification in the early 20th century, there was a major boom in the manufacturing of ...


Insulators Antique & Collectable: Looking for Insulators of glass or pottery have been made for use on telegraph or telephone poles since 1844. Thousands of different styles of insulators have been made. Most common are those of clear or aqua glass;1


Welcome to the Hemingray Glass Insulator Database! The Hemingray Glass Company operated between 1848-1972 and was the largest manufacturer of glass insulators in the world. Here's where you'll find photos and information on all Hemingray glass insulators.


Insulating glass becomes a conductor of electricity when heated red-hot with a blowtorch. (m) (T+) What it Shows. At room temerature, glass is almost as good an insulator as hard rubber. When heated to 1000 K, however, glass has a resistivity of less than 10 7 ohm-meters (Purcell 1 fig. 4.8 pp 140). As glass becomes molten the once immobile ...


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The condition of the insulator. Naturally the more damage an insulator has, the lower its value. Insulator price guides generally give a range of values (e.g. $20-30). The high end value is usually Mint (no damage), and the low end value would be Near Mint (some damage). More extensive damage would be valued even lower.


U-factor and U-value are interchangeable terms referring to a measure of the heat gain or loss through glass due to the difference between indoor and outdoor air temperatures. U-factor or U-value is also referred to as the overall coefficient of heat transfer.