Hemingray Insulator Profile: CD 302  
This style is the No.75, the smaller of the two Muncie Types with a 7" diameter. See also CD 303/310

Dimensions: 4 3/4" H x 7" W
Primary
Embossing:
HEMINGRAY
Years Produced:
c.1893-1920s
Style Numbers:75, Muncie Type, Ohio
Rarity Scale (1-10): Fairly Common (4)
Usage: High Voltage
Hobby Nickname: Muncie
Voltage Rating: 40,000 Volts
Mold Variation Collapse

1 3/8" Pinhole Variant

In addition to the standard 1" diameter pinhole, Hemingray also manufactured a special 1 3/8" pinhole for larger pins. Note the thicker neck to accommodate the wider pinhole. This variant appears in the [040] and [060] embossings.

Known Embossings (5) Collapse
 
HEMINGRAY [020] (F-Skirt) HEMINGRAY/PATENT MAY 2ND 1893 (R-Skirt) MADE IN U.S.A./MUNCIE TYPE/Nº 75 RDP Photo
HEMINGRAY [030] (F-Skirt) HEMINGRAY/PATENT MAY 2ND 1893 (R-Skirt) MUNCIE TYPE RDP < WANTED! 
HEMINGRAY [040] (F-Skirt) HEMINGRAY/PATENT MAY 2ND 1893 (R-Skirt) MUNCIE {1 3/8" pinhole} RDP Photo
HEMINGRAY [050] (F-Skirt) HEMINGRAY/PATENT MAY 2ND 1893 (R-Skirt) OHIO RDP < WANTED! 
HEMINGRAY [060] (F-Skirt) HEMINGRAY/PATENT MAY 2ND 1893 (R-Skirt) OHIO {1 3/8" pinhole} RDP < WANTED! 

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

Unverified Embossings
Year Removed
HEMINGRAY None (F-Skirt) HEMINGRAY-75/PATENT MAY 2 1893 (R-Skirt) MUNCIE RDP 1995
HEMINGRAY [010] (F-Skirt) HEMINGRAY/PATENT MAY 2ND 1893 RDP 1999





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