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


CD 307 Insulators for Sale
Photos (click to enlarge) Description / Condition Color Current Price
Guide Value
Sale Price
PhotoPhoto CD 307 Hemingray [010]

Rare CD 307 Hemingray High Potential in what I would consider to be Blue Aqua. Has one thumbnail chip on the front skirt, a pinky chip on the inner skirt, a hard to see 1" crack on the front left skirt, a few flaked drips, and one nibble on the top of the left ear. Displays mint from the High Potential side. Overall pretty decent condition for one of these.
Blue Aqua $250-300 $220
SOLD!



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