Hemingray Insulator Profile: CD 304/310  
This style is nicknamed the "Coolie Hat", and appears to be the replacement for the earlier CD 303/310 9" Muncie Type. 

Dimensions: 12" H x 9" W
Primary
Embossings:
• HEMINGRAY
• NO EMBOSSING
Years Produced:
c.1910s-1920s
Rarity Scale (1-10): Fairly Common (4)
Usage: High Voltage
Hobby Nickname: Coolie Hat
Known Embossings (3) Collapse
 
HEMINGRAY [010] (F-Skirt) HEMINGRAY/PATENT MAY 2 1893 {CD 310 sleeve is unembossed} SDP Photo
NEW! HEMINGRAY [020] (F-Skirt) HEMINGRAY/PATENT MAY 2 1883 {Note 'MAY 2 1883' date} {CD 310 sleeve is unembossed} SDP Photo
NO EMBOSSING [010] [No embossing] {Hemingray product} 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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