1898 Western Electric page 421

Western Union double petticoat teat.

The points or teats on the lower rim of the petticoat· attract the water on the outer surface of the insulator Into drops. The water drops from these points, thereby preventing the moisture from creeping· up on the inner petticoat, and thence to the pin.

Other insulators can be made in same manner at special prices.

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All the Hemingray styles in the catalog are as shown "smooth base." I guess special order you could get drip points?