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CD 147
Patented Oct. 8, 1907
Insulator Facts

Dimensions:4 1⁄4" H × 3" W
Primary Embossings:The Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
Years Produced: c.1907-1920s
Rarity Scale 0. No specimens known
1. Extremely Common (millions known)
2. Very Common
3. Common
4. Fairly Common
5. Uncommon
6. Very Uncommon
7. Rare (dozens known)
8. Very Rare (less than a dozen known)
9. Extremely Rare (2 or 3 known)
10. Unique (only one known)
 Very Common (2/10)
Usage: Telegraph
Hobby Nickname: Spiral Groove
Value Range: This is an estimated value range only, based on historical hobby collecting data. Insulator values vary widely depending on many factors, including embossing, color, condition, mold variations, manufacturing anomalies, and other attributes. Please visit the Hemingray Values page for more information.
 $1-400
Please Note: This insulator style was also made by other manufacturers, not just Hemingray. This page will only detail the specific variant(s) manufactured, or suspected to be manufactured, by Hemingray.
Insulator Overview

Nicknamed the spiral groove because of the unique spiral-shaped wire groove patented on October 8, 1907. 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.) Hemingray also manufactured the unembossed CD 147.

Related Links:
Known Embossings (11)
Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
Year AddedThis is the year that this embossing was officially recognized and added to the McDougald (1991-2008) or Briel (2011-2023) insulator price guides. It is not necessarily the year this embossing was discovered.
 Photo
Status✓ = In my collection

If the value in this column says WANTED, then that specific insulator is on my wanted list! If you have that insulator and would like to sell it, click on the WANTED link to submit photos and contact me.
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✓
HEMINGRAY [015] (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT. 8 1907 {Note '0' embossed over '9' in '1907'} SB 2015 No Photo-
HEMINGRAY [016] (F-Skirt) HEMINGRAY (R-Skirt) PATENTED OCT. 8 1907. {'C'/'G'} SB 2019 No Photo✓
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) [#] (F-Skirt) PATENTED OCT. 8 1907. {Comes in various period patterns} {Hemingray product} SB - Photo✓
PATENT - OTHER [010] (Dome) [#] (F-Skirt) PATENT'D OCT 8 1907 {Hemingray product} SB - Photo✓
PATENT - OTHER [015] (Dome) [#] (F-Skirt) PATENT'D OCT 8 1907 {'0'/'9'} {Hemingray product} SB - No Photo-
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✓
Removed Embossing

The following embossing(s) were removed from the price guide because they could not be verified to exist, were consolidated with other embossings, or were otherwise ambiguous/inaccurate. They are preserved here for historical purposes.


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Primary EmbossingThe Primary Embossing is typically found on the front of the insulator and usually identifies either the manufacturer (such as "Hemingray") or the company that the insulator was made for (such as "AM.TEL.&TEL.CO.")

Insulators with No Name or No Embossing are denoted as such.
EINThe Embossing Index Number (EIN) is a unique number assigned by the collecting hobby to each distinct embossing for an insulator design. It is normally shown in brackets, e.g. [050].
EmbossingMost common terms:
(F-Skirt): Front Skirt
(R-Skirt): Rear Skirt
/: New line of embossing
{}: Special note (not embossed on the insulator)
[#]: Represents a number

Other terms:
{MLOB}: Mold Line Over Base
(F-Crown): Front Crown
(R-Crown): Rear Crown
(F-Umbrella): Front Umbrella
(R-Umbrella): Rear Umbrella
BaseThe base is the bottom of the insulator. Hemingray made 4 different types of bases:

1. SDP: Sharp Drip Points
2. RDP: Round Drip Points
3. CB: Corrugated Base
4. SB: Smooth Base
 Year Removed
n/a
Known Colors (5)
ColorThe color of the insulator.
Aqua
Emerald Green
Green
Light Aqua
Milky Aqua