Hemingray Insulator Profile: CD 152  
The Hemingray No.40 is a very common and popular style, and was mass produced in aqua and green colors. In c.1910, an experiment with AT&T to produce a new standard insulator resulted in this design being selected. It was produced in mass quantities until 1921, when the Hemingray No.40 was replaced by the extremely popular Hemingray - 42 (CD 154). 

Dimensions: 4" H x 3 1/2" W
Primary
Embossing:
HEMINGRAY
Years Produced:
c.1910-1921
Style Number:40
Rarity Scale (1-10): Extremely Common (1)
Usage: Telegraph
Trade Name: Double Petticoat, New W.U. Standard
Hobby Nickname: Hoopskirt
Voltage Rating: 5,000 Volts
Mold Variation Collapse

Brookfield Style Mold

Shown at left is the [085] "Brookfield style" mold variation, named so because its features resemble the molds produced by Brookfield. Note the squarer crown, smaller wire groove lips, and steeper sloped skirt. Compare this to the standard mold shown above.

Known Embossings (12) Collapse
 
HEMINGRAY [010] (Dome) ['4', '5', '7' or '8'] (F-Skirt) HEMINGRAY (R-Skirt) Nº 40 SDP Photo
HEMINGRAY [015] (Dome) {Small 5 rotated inside of a large 7} (F-Skirt) HEMINGRAY (R-Skirt) Nº 40 SDP < WANTED! 
HEMINGRAY [020] (Dome) ['4', '5', '7' or '8'] (F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) Nº 40 SDP
HEMINGRAY [030] (F-Skirt) HEMINGRAY (R-Skirt) Nº 40 SB < WANTED! 
HEMINGRAY [040] (F-Skirt) HEMINGRAY (R-Skirt) Nº 40 SDP Photo
HEMINGRAY [050] (F-Skirt) HEMINGRAY (R-Skirt) Nº : 40 or Nº 40: {Comes with several punctuation variations, with dots or dashes on front or rear skirt} SDP Photo
HEMINGRAY [060] (F-Skirt) HEMINGRAY/MADE IN U.S.A. (R-Skirt) Nº 40 SDP Photo
HEMINGRAY [070] (F-Skirt) HEMINGRAY/Nº 40 (R-Skirt) HEMINGRAY SDP Photo
HEMINGRAY [075] (F-Skirt) HEMINGRAY/Nº 40 (R-Skirt) PATENTED/MAY 2 1893 RDP Photo
HEMINGRAY [080] (F-Skirt) HEMINGRAY/Nº 40 (R-Skirt) PATENTED/MAY 2 1893 SDP
HEMINGRAY [085] (F-Skirt) HEMINGRAY/Nº 40 (R-Skirt) PATENTED/MAY 2 1893 {Brookfield style} SDP Photo
HEMINGRAY [100] (F-Skirt) HEMINGRAY/·Nº·40· or Nº ·· 40 (R-Skirt) PATENTED/MAY 2 1893 {Comes with several punctuation variations, with dots or dashes on front or rear skirt} 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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