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; most desirable are the threadless types made from 1850 to 1870. Most insulators are made of glass or pottery. There is a well-organized group of collectors with clubs and publications. CD numbers are Consolidated Design numbers, used by collectors to indicate shapes.
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|Image||Category||Pattern or Item||Description||Year Priced||Price|
|Insulators||Fred M. Locke Victor||U259, White, Porcelain, Flared Skirt, Pony Style||2011||Insulators||Gayner||No. 20, Blue Aqua,,||2011||Insulators||Hemingray||Amber Swirls||2011||Insulators||Hemingray||Blue||2011||Insulators||Hemingray||Continous Drip 162, Brilliant Orange Amber,,||2011||Insulators||Hemingray||Green, Amber Swirls,,||2011||Insulators||Hemingray||No. 9, Medium Amethyst,,||2011||Insulators||Hemingray||No. 16, Emerald Green,,||2011||Insulators||Hemingray||No. 16, Olive Green,,||2011||Insulators||Hemingray||No. 20, Carnival,,||2011||Insulators||H.G. Co.||Continuous Drip, No. 145, Beehive, I Petticoat, Medium Amber||2011||Insulators||Knowles||No. 020, Cable, Green, Amber||2011||Insulators||Lynchburg||No. 90, Aqua,,||2011||Insulators||Lynchburg||No. 90, Green, Straw Tint,||2011||Insulators||McLaughlin||No. 16, Citrine,,||2011||Insulators||McLaughlin||No. 16, Emerald Green,,||2011||Insulators||McLaughlin||No. 16, Olive Black,,||2011||Insulators||Mt. Washington||Ram’s Horn, Cobalt Blue,,||2011||Insulators||Mulford & Biddle||Continuous Drip 735, Aqua, 1866-68,||2011||Insulators||National||Continuous Drip 110, Blue Aqua, Embossed Base,||2011||Insulators||Oakman MFG Co.||Continuous Drip 140, Aqua,,||2011||Insulators||Otis Patent 1851||Copper Top, Prongs, Iron Base Bracket, Amethyst||2011||Insulators||Patent||No. 20, Pleated & Concave Skirt, Aqua,||2011||Insulators||Patent||No. 20, Pleated Skirt, Leaner,||2011||Insulators||Pond Style||Wooden, Zinc Cap, Wire Groove,||2011|