How do you date glass insulators?
All dots around the year code should be counted (a colon counts as two dots), and added to the date of mold manufacture. This gives the actual date the insulator was produced. Style 3 is the most common.
What is the oldest glass insulator?
The oldest glass insulators date from about 1846. 40, Hemingray-42, Hemingray-45 (or Armstrong DP-1), and (the oldest insulators on this pole) aqua “beehives” which are marked “H.G. CO.” The period from 1875 to 1930 might generally be thought of as the “heyday” of the glass insulator.
What is a vintage glass insulator?
Vintage Glass insulators were first produced in the 1850s for telegraph lines, then for telephone and power transmission lines. They insulated and protected the wooden poles from the electricity coursing through the wires. They are made from glass, porcelain, or composite polymer materials (non-conductive materials).
How much are glass insulators worth?
Glass Insulator Value Old glass insulators can range in value from $2 up to over $400. Like other antiques, glass insulators are evaluated on several criteria: Age. Rarity.
Are clear glass insulators worth anything?
Are electric insulators worth anything?
Old glass insulators can range in value from $2 up to over $400. Like other antiques, glass insulators are evaluated on several criteria: Age. Rarity.
What are my glass insulators worth?
When was the first glass telegraph insulator made?
Two early glass telegraph insulators made by Hemingray Glass Company at their Covington, KY factory. They are the CD 132 style, and date from the 1870s or 1880s. The insulators are marked “PATENT / DEC 19 1871” with a “2” on the reverse. In this case the “2” served as the model or catalog number.
What’s the model number of a glass insulator?
The insulators are marked “PATENT / DEC 19 1871” with a “2” on the reverse. In this case the “2” served as the model or catalog number. Many earlier insulators have bubbles, streaking, “snow”, surface creases and other marks of crudeness which was common for this type of glass because quality standards were not usually set as high as tableware.
Which is the rarest type of insulator to own?
The rarest insulator I own is a Fry Glass insulator. It’s the same kind of opal glass they used on their tableware, called oven glass, because it did very well with heat changes. It was a popular kind of glass, but their insulators didn’t sell well.
Why was glass used as an electrical insulator?
Their sole purpose was to insulate the wire from the wood, reason for which materials such as glass, porcelain or composite polymer materials had been chosen. An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it nearly impossible…
When did they start making glass insulators for telegraph lines?
Disclaimer | This article may contain affiliate links, this means that at no cost to you, we may receive a small commission for qualifying purchases. In 1850 companies such as Hemingray, Bookfield and Whitall Tatum started producing glass insulators for telegraph lines, telephone and power transmission lines later on.
What was the purpose of vintage glass insulators?
Vintage Glass insulators were first produced in the 1850s for telegraph lines, then for telephone and power transmission lines. They insulated and protected the wooden poles from the electricity coursing through the wires. They are made from glass, porcelain, or composite polymer materials (non-conductive materials).
The insulators are marked “PATENT / DEC 19 1871” with a “2” on the reverse. In this case the “2” served as the model or catalog number. Many earlier insulators have bubbles, streaking, “snow”, surface creases and other marks of crudeness which was common for this type of glass because quality standards were not usually set as high as tableware.
What kind of insulators do they use in Yreka?
But today, if I walk around Yreka, there’s hardly any glass at all, usually for telecommunications they use cables, which don’t need insulators. For the power, they almost exclusively use porcelain. For new construction they will only sometimes use glass on the high power pylons.
