In the 1950s electrical companies transitioned to porcelain insulators.
Ceramic insulators value.
Similar to their glass counterparts porcelain insulators date back to before the civil war for telegraph wires.
This transition was complete by the 1970s.
If the ceramic is glazed as zareba insulators are the glaze is only baked into the top layer.
As technology developed insulators were needed for telephone lines electric power lines and other applications.
Glass insulators were first produced in the 1850 s for use with telegraph lines.
Once it s shaped it is fired between 2 100 to 2 300 fahrenheit.
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This increased the need for the glass insulator and more companies sprang up in response to the need.
Link to other types of insulators.
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Ceramic is less expensive to produce than porcelain.
Vintage insulators are most commonly made out of porcelain or glass materials and they come in a wide variety of colors and shapes making each item a unique piece that can make a great addition to a collection.
In the mid 1960 s a few people began collecting these glass and porcelain insulators.
Collecting insulators is a fun and unique hobby that will allow you to learn much about the history and make of these unique objects.
Must have new guide book too for u chart and u numbers value guide can not be used by itself alone without the guide book value guide 3rd edition for unipart and multipart porcelain insulator.
Ceramic is made of red brown or white porous clay.
Click on an insulator above for more information.
Insulators were originally designed to keep the wires linking telegraphs and telephones insulated from the wooden poles that held them aloft.
Most of the insulators available today come from this era.
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The 126 page value guide lists manufacturer marking catalog number color rarity and value for 4354 different unipart pin type styles and 1201 different multipart pin type styles.
Today there are over 2000 collectors and insulator clubs national shows and good reference books are available.
From 1920 to 1950 there was a peak in the manufacture of glass insulators.
Return to the national insulator association page.