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.
Ceramic telegraph wire insulators.
Vintage locke porcelain ceramic insulator usa 9995 brown telegraph electric e2.
Set of 2 1930 s large aqua telegraph wire insulators for making light fixtures projects moderncharminteriors.
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Vintage hemingray glass insulator no.
Nice blue telegraph glass insulator cd 565 1 ussr soviet russian.
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Vintage porcelain glass insulator with telegraph wire still attached.
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Lot of 3 vtg antique ohio brass knox guy wire insulators ceramic porcelain brown.
In north america glass was always the predominate material for communications insulators but porcelain has become the standard for power distribution due to its greater strength and surface resistance.
19 blue green usa telegraph phone electric.
Insulators were first developed in the mid 1800s to be used on telegraph and telephone lines to contain the electrical current and prevent the current from entering the ground below.