Hemingray Insulator Profile: CD 307  
This style is the uncommon "High Potential." It is essentially a triple petticoat version of the CD 257 intended for high voltage applications. It was assigned the No.70 style number in the 1915 Western Electric catalog, though no specimens exist with such an embossing. 

Dimensions: 4 7/8" H x 4 3/4" W
Primary
Embossing:
HEMINGRAY
Years Produced:
c.1893-1910s
Style Number:High Potential
Rarity Scale (1-10): Very Uncommon (6)
Usage: High Voltage
Trade Name: High Potential Triple Petticoat Cable
Voltage Rating: 10,000 Volts
Known Embossing Collapse
 
HEMINGRAY [010] (F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (R-Skirt) HIGH POTENTIAL/TRIPLE PETTICOAT CABLE SDP Photo

The following embossings were removed from the price guide because they could not be verified to exist:

Unverified Embossings
Year Removed





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