CD 181 original use

By Bob Stahr; posted August 9, 2009

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This is a picture of the electrical tunnel at the World's Columbian Exposition in Chicago in 1893. The crossarms contain a mixture of insulators, including several CD 181 "Plutos" that were designed by R. H. Pierce and was known as the "Pierce Butterfly Insulator."

See related graphic here: [id=254425943]

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