Hemingray Dots

CD 290-309

Saddle wire groove - Triple petticoat


CD 304/310

CD 304/310

Size: 228mm x 304mm (9" x 12")

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Years produced: c.1910s-1920s
Style (CD) scarcity: 6, 501-1,000 known
Intended use: High Voltage
Notes: Based off the design of the CD 303/310. The CD 304/310 became a reality due to some design changes made to strengthen the neck of the insulator as under extreme conditions the tops were breaking. See this article for more info. Also check out the photos of them in use.

Primary EmbossingEINEmbossingBaseColor
HEMINGRAY[010](F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (CD 310 sleeve is unembossed)SDPAqua
HEMINGRAY[010](F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (CD 310 sleeve is unembossed)SDPAqua w/ Milk Swirls
HEMINGRAY[010](F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (CD 310 sleeve is unembossed)SDPBlue Aqua
HEMINGRAY[010](F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (CD 310 sleeve is unembossed)SDPGreen
HEMINGRAY[010](F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (CD 310 sleeve is unembossed)SDPGreen Aqua
HEMINGRAY[010](F-Skirt) HEMINGRAY/PATENT MAY 2 1893 (CD 310 sleeve is unembossed)SDPHemingray Blue
HEMINGRAY[020](F-Skirt) HEMINGRAY/PATENT MAY 2 1883 (Note MAY 2 1883 date} (CD 310 sleeve is unembossed)SDPAqua
NO EMBOSSING[010](No embossing) (Hemingray product)SDPAqua
  • [010] - Blue Aqua

    HEMINGRAY

    [010]

    Blue Aqua

  • [020] - Green

    HEMINGRAY

    [020]

    Green

    Details

    True green examples are hard to find.

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