For the past year I have been doing extensive research on all types of
porcelain insulators other than pin types in preparation for future publication
of a book on these. An interesting part of this work is that of tracking down
the origins of the numerous markings involved on "standard porcelain",
line items and specialty insulators.
The markings listed below are from my card file and are published here at
this time for the benefit of those who do collect these types of insulators.
This list does not include the markings on pin types and which are already
available in other publications. I would like to hear of any not in this list
and especially those which occur on specimens in combination with full names,
patent dates or patent numbers. If anyone has catalogs, buyer's guides,
electrical industry indexes, trademark and tradename indexes, or specimens which
can be used to attribute these and similar markings, please speak up.
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Appleton Electric Co., Chicago
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| A C F Co. |
(Unattributed)
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| A. E. Co. |
Automatic Electric Co., Chicago (GTE A. E., Inc.)
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| AETNA |
Albert & J. M. Anderson Mfg. Co., Boston
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| AICO |
American Insulator Co., Now Freedom, Pa.
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| ALLIGATOR |
Porcelain Products, Inc., Carey (& Findlay), Ohio
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| A. P. Co. |
(Unattributed)
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| APPLETON ELECTRIC CO. |
That Co., Chicago, IL.
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| ARROW |
Arrow Electric Co., Hartford, Conn. (specialties) (continued)
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| ARROW |
Arrow Conductor & Mfg. Co., Chicago, IL. (for lightning arresters)
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| B |
(Unattributed) (tubes)
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| B & B |
Betts & Betts Corp., New York |
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B & D |
Buffinton & Dow patent (Lic., all Cos.)
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BENJAMIN |
Benjamin Elec. Mfg. Co., Chicago, IL.
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BEMLOW |
(via J. H. Parker & Son) (mine insulators)
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BIRNBACH |
(Unattributed) (specialties)
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BLAKE |
Blake Signal & Mfg. Co., Boston
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BOSS |
Electrical Specialty Co., Providence, R.I.
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BRACH |
L. S. Brach Mfg. Co., Newark, N.J.
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BRUNT |
Brunt Porcelain Co., E. Liverpool, Ohio
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BRYANT |
Bryant Electric Co., Bridgeport, Conn.
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BUCKEYE |
Trenton Porcelain Co., Trenton N.J.
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BULL DOG |
Illinois Electric Porcelain, Macomb, IL.
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C |
(Unattributed) (split knobs)
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 |
(Unattributed) (split knobs)
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 |
(Unattributed) (cleats, rack spools)
|
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CAPLETS |
James C. Phelps, Springfield, Mass.
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| CAREY / OHIO |
National Elec. Porc. Co., Carey, Ohio
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| C E CO. |
(Unattributed) (cleats)
|
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CEMCO |
Connecticut Elec Mfg Co, Bridgeport, Conn.
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CENCO |
(Unattributed) (cleats)
|
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C. G. R. |
Charles G. Robin, New York
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C - H |
Cuttler-Hammer Mfg. Co., Milwaukee, Wis.
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CHAPMAN |
Minnesota Elec. Co., Minneapolis, Minn.
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CINCH |
Brunt Porcelain Co. (for split knobs)
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COLONIAL |
Colonial Insulator Co., Akron, Ohio
|
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COOK |
Cook Electric Co., Chicago, IL.
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C. O. P. |
Nat'l Elec Porc Co, Carey (Carey, o. Porc.)
|
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CORWICO |
(Unattributed) (specialties)
|
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C P Co |
(Unattributed) (split knobs)
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CRESCENT |
Kirchberger & Co., Brooklyn, N.Y.
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| CROUSE-HINDS |
Crouse-Hinds Co., Syracuse, N.Y.
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CUTTER |
Scott C. Cutter, Oswego, IL. (cont.)
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| C W & A C |
Consolidated Wire & Associated Corps., Chi
|
 |
The Square-D Company, Peru, Indiana
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| DETROIT |
(via J. H. Parker) (porcelain knobs)
|
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DOUBLEX |
(via J. H. Parker) (strain insulators)
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DUGGAN |
Imperial Porcelain Works, Trenton, N.J.
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DYKE |
(via J. H. Parker) (porcelain knobs)
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|
E |
(Unattributed) (knobs, split knobs, etc.)
|
 |
Standard Specialty Mfg. Co., Cleveland
|
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E E E |
Elec. Engineers Equipment Co., Chicago
|
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EFFICIENCY |
Efficiency Elec. Co., East Palestine, Ohio
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ELECTROLET |
Killark Elec. Mfg. Co., St. Louis, Mo.
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| E. M. |
(Unattributed) (wireholders)
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| E. M. Co. |
(Unattributed) (wireholders)
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EMILY |
(Unattributed) (porcelain screweyes)
|
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E. M. W. Co. |
(Unattributed) (wireholders)
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E P Co. |
(Unattributed) (cleats)
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| E. R. E. |
Elec Rwy Equip Co., Cincinnati, 0H (mines)
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ERIE |
Erie Elec. Equipment Co., Johnstown, Pa.
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E. S. S. Co. |
Elec. Service Supplies Co., Phila., Pa.
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| EVEREADY |
Eveready Porcelain Co., E. Liverpool, Ohio
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E-Z WIRE |
Peerless Light Co., Chicago
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F |
Findlay Elec. Porcelain Co., Findlay, Ohio
|
 |
Findlay Elec. Porc. (on contract item only)
|
 |
E. H. Freeman Elec. Co., Trenton, N.J.
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 |
Diamond State Fibre Co., Bridgeport, Conn.
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FARM MASTER |
(Unattributed) (elec. fence porcelains)
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F. E. Co. |
Federal Electric Co., Chicago
|
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FEDCO |
Federal Pore. Co., Carey, 0. (1917-1927)
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F E P Co |
Findlay Elec. Porc. Co., Findlay, Ohio
|
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FINDLAY |
same (also distr. by Trenton Porc., Co.)
|
 |
same (1911-1927). P.P. Inc. (1927-1958)
|
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FLETCHER |
Fletcher Mfg. Co., Dayton, Ohio
|
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FRANKLIN |
Elec. Devel. & Machine Co., Phil&., Pa.
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