CD 147
HEMINGRAY
[010] (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT. 8 1907. {Comes in various period patterns; last period may also be a dash} SBAqua . . . . . . . . . . . . . . . . . under $1
This spiral groove style was patented on October 8, 1907 by John C. Barclay. He claimed that "the insulators may be removed and replaced without unwrapping the tie wire from the line wire and without the slightest injury to the line wire." This insulator saw wide spread use in the 1910's.