Material: glass. Size: 2 3/4" diameter x 3 7/8" H. Color and description: clear glass - stamped: "Hemingray 17 - Made in the U.S.A. 25 - 50". CD: 122 Internet Information: Manufacturer: Hemingray Style Number: 17 Trade Name: Long Distance & Toll Line Size: 2 3/4" W x 3 7/8" H. Weight: 15 oz. Production Date: 1920's - 1960s Usage: Telephone (long distance) "In the early days of the telephone, single petticoat insulators were standard for toll line construction. The Hemingray No. 16, with a single petticoat is still widely used for lines of medium length." "The No. 16 has about the longest leakage path possible for a single petticoat type on a standard pin. It has a square wire groove." "The No. 17 is exactly similar to the No. 16 except it has a somewhat wider groove for larger wire."
