Specialty Electrical Porcelain

(Non-Standard Porcelain Electrical Insulators)

 

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Specialty Porcelain Photos:     

Other Photos - These are photos that show insulators in service.

Catalogs - under construction

 

Porcelain manufacturers produced a lot of different styles other than the Standard Porcelain styles.  These insulators were called "specialty porcelain" and it was a large part of business for many companies.  Also, several customers, such as telephone companies, wanted their names on the items.  A great variety is shown on these pages, but it is just a small sampling of all the various specialty items.  In later years, making specialty porcelain became too costly, so customers were forced to purchase standard styles, which were much cheaper to make in mass quantities.

The following table shows 57 different specialty porcelain insulators in my collection.  Cataloging specialty porcelain does not follow any sort of categorizing.  The cataloging numbers us "SP" for specialty porcelain with the number following simply a reference number for the particular style.  In order to see photos of each style, click on the link in the table for a specific insulator, or browse the pages of photos:  Photos of Specialty Porcelain.

SP = Specialty Porcelain

emb: embossed

r-e: recess-embossed

u-g: under-glaze ink

/ : marking on opposite side

// : marking on bottom or opposite side

 

No. MARKING Marking Type Color Company Notes
SP1-01 N. E. T. & T. CO. / U. S. A. r-e / emb white   New England Telephone & Telegraph Co.
SP1-02 N E T & T r-e white   New England Telephone & Telegraph Co.
SP1-03 .N. E. T. & T. CO. r-e white   New England Telephone & Telegraph Co.
           
SP2-01 S. M. T. CO. emb white   Southern Massachusetts Telephone Co.
SP2-02 N E T & T CO emb white   New England Telephone & Telegraph Co.
SP2-03 N. E. T. & T. CO. emb white   New England Telephone & Telegraph Co.
           
SP3-01 S. M. T. CO. r-e white   Southern Massachusetts Telephone Co.
SP3-02 N E T & T CO r-e white   New England Telephone & Telegraph Co.
SP3-03 N. E. T. & T. CO. / .T r-e / emb white   New England Telephone & Telegraph Co.
SP3-04 C. O. P. emb white Carey Ohio Porcelain Co.  
SP3-05 KNOX / 6061 r-e white Knox Porcelain Corp.  
SP3-06 P. P. / U.S.A. / 6061 r-e white Porcelain Products Inc.  
SP3-07 N-N   white    
SP3-08 N. E. T. & T. CO. emb white   New England Telephone & Telegraph Co.
SP3-09 N E T & T CO emb white   New England Telephone & Telegraph Co.
           
SP4-01 F emb white    
SP4-02 N-N   white    
           
SP5-01 N-N   white    
           
SP6-01 N-N (Thomas)   brown    
           
SP7-01 N-N (Findlay)   white    
           
SP8-01 N. E. T. & T. CO. r-e white   New England Telephone & Telegraph Co.
SP8-02 N. E. T. & T. CO. r-e white   New England Telephone & Telegraph Co.
SP8-03 N. E. T. & T. CO. r-e white   New England Telephone & Telegraph Co.
SP8-04 N. E. T. & T. CO. / T r-e white   New England Telephone & Telegraph Co.
SP8-05 KNOX / 7139 r-e white    
SP8-06 N-N   white    
           
SP9-01 HALL / G emb white    
SP9-02 A. P. Co. emb white    
           
SP10-01 S M T CO r-e white   Southern Massachusetts Telephone Co.
SP10-02 N E T & T CO r-e white   New England Telephone & Telegraph Co.
SP10-03 N E T & T CO r-e white   New England Telephone & Telegraph Co.
SP10-04 U (in circle) r-e white    
SP10-05 T (underneath) r-e white    
SP10-06 N-N   white    
SP10-07 N-N   white    
           
SP11-01 N-N   white    
SP11-02 N-N   brown    
           
SP12-01 PATD. JAN. 16, 1917 r-e white   patent 1,213,011
           
SP13-01 N-N   white   2" x 2-1/8"
           
SP14-01 NO. 8 P&S / PAT. JUNE 14 92 r-e white   Bain break knob; patent 476,813
SP14-02 F. E. P. CO. / 1922 emb brown   Bain break knob
SP14-03 P&S / PAT / 14 ?? r-e white   Bain break knob; patent 476,813
SP14-04 P&S NO ? / PAT.D emb white   Bain break knob; patent 476,813
SP14-05 P & S / PAT.D emb white   Bain break knob; patent 476,813
           
SP15-01 N-N   white   1-3/8" x 2"
           
SP16-01 B F / R C emb white    
SP16-02 KRETZER BRAND emb white    
SP16-03 NO 32 (underneath) emb white    
SP16-04 N-N   white    
SP16-05 KRETZER BRAND emb white    
           
SP17-01 N-N   white Gamewell Fire Alarm Telegraph Co. Jimmy Burns referenced Gerald Brown's book: It was used as a support for glass rods upon which batteries were placed.  The batteries were electrical backup for Gamewell fire alarms.  Patent dated Sept. 4, 1923 (1,466,674) was associated with the battery.
SP17-02 N-N   white    
           
SP18-01 KNOX / 7050 r-e white    
SP18-02 N-N   white    
SP18-03 WISP / NO. 3 r-e white    
           
SP19-01 SACKETT / PATD NOV 10 08 emb white   patent 903,692
           
SP20-01 UNIVERSAL / 1001 // PATENTED / APR 12 1910 r-e brown   patent 954,596; commonly called the baby fire plug
SP20-02 1002 // Triangle M r-e brown   patent 954,596; medium size fire plug
SP20-03 PATENTED / APR 12 1910 // Triangle M r-e brown   patent 954,596; large size fire plug

 

Specialty Porcelain Photos:     

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