petticoat insulator

noun

Electricity.

a bell-shaped insulator used for high-voltage insulation.

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Example Sentences

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One, in which paraffin appears as a cement, is an insulating stand made out of a bit of glass or ebonite tube cemented into an Erlenmeyer flask, having its neck protected from dust when out of use by a rubber washer, the other a "petticoat" insulator made by cementing a flint glass bottle into a glass dish with paraffin.