Hemingray Insulator Profile: CD 147  
Nicknamed the spiral groove because of the unique spiral-shaped wire groove patented on October 8, 1907 (see patent). These were made both by Hemingray and Brookfield. The quickest way to identify a Hemingray-made CD 147 is to check the embossing. "PATENTED OCT 8 1907" will always appear together on one side of the insulator. (Brookfields always have a separate "PATENTED" on one side by itself.) 

Dimensions: 4 1/4" H x 3" W
Primary
Embossings:
• HEMINGRAY
• NO EMBOSSING
• PATENT - OTHER
Years Produced:
c.1907-1920s
Rarity Scale (1-10): Very Common (2)
Hobby Nickname: Spiral Groove
Known Embossings (11) Collapse
 
HEMINGRAY Unlisted (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT. 8 1907. {'C' is engraved over a 'G'} SB Photo
HEMINGRAY [010] (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT. 8 1907 {Comes in various period patterns; last period may also be a dash) SB Photo
NEW! HEMINGRAY [015] (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT. 8 1907 {Note '0' embossed over '9' in '1907'} SB < WANTED! 
HEMINGRAY [020] (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT 8 1907 {Note second 'E' is backwards} SB Photo
NO EMBOSSING [010] [No embossing] {Hemingray product} SB Photo
PATENT - OTHER [005] (Dome) [Number] (F-Skirt) PATENTED OCT. 8 1907. {Comes in various period patterns} {Hemingray product} SB Photo
PATENT - OTHER [010] (Dome) [Number] (F-Skirt) PATENT'D OCT 8 1907 {Hemingray product} SB Photo
PATENT - OTHER [015] (Dome) [Number] (F-Skirt) PATENT'D OCT 8 1907 {'0' is engraved over a '9'} {Hemingray product} SB < WANTED! 
PATENT - OTHER [040] (F-Skirt) PATENTED OCT. 8 1907. {Comes in various period patterns; last period may also be a dash} {Hemingray product} SB Photo
PATENT - OTHER [045] (F-Skirt) PATENT'D OCT 8 1907 {Hemingray product} SB Photo
PATENT - OTHER [050] (F-Skirt) PATNTED OCT. 8 1907. {Note spelling} {Hemingray product} SB 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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