19 blue green usa telegraph phone electric.
Ceramic telegraph wire insulators.
Electric wire insulator brown porcelain ceramic telephone telegraph railroad railway farm threaded lag bolt antique electricity utility.
Vintage hemingray glass insulator no.
Similar to their glass counterparts porcelain insulators date back to before the civil war for telegraph wires.
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.
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Nice blue telegraph glass insulator cd 565 1 ussr soviet russian.
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.
Set of 2 1930 s large aqua telegraph wire insulators for making light fixtures projects moderncharminteriors.
Vintage locke porcelain ceramic insulator usa 9995 brown telegraph electric e2.
Vintage porcelain glass insulator with telegraph wire still attached.
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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.