ST-6750-6874
254mm - 298mm (10" - 11.75")
ST-6755
Size: 255mm (10”)
Example in Photo: J-D (USA)
Photo Credit: Mid Norris
Example in Photo: J-D (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
| Manufacturer | Insulator Markings | Cap Markings | Color | Country |
|---|---|---|---|---|
| JD | (Under-glaze Ink) (JD Logo) MFG. (Date) | P / 550 | Brown | USA |
ST-6800
Size: 282mm (11.125")
Example in Photo: No Name (J-D) (USA)
Photo Credit: Mid Norris
Patent: 1,329,770 - Patented Feb. 3,1920
Patent: 1,716,963 - Patented June 11, 1929
Example in Photo: No Name (J-D) (USA)
Photo Credit: Mid Norris
Patent: 1,329,770 - Patented Feb. 3,1920
Patent: 1,716,963 - Patented June 11, 1929
Direct link to this insulator:
| Manufacturer | Insulator Markings | Cap Markings | Color | Country |
|---|---|---|---|---|
| JD | (Under-glaze Ink) (JD Logo) / Date / Numbers | Light Blue | USA | |
| JD | (Under-glaze Ink) (JD Logo) / MFG. (date) / Pat. Nos. 1,329,770 & 1,716,963 | Light Blue | USA | |
| JD | (Under-glaze Ink) HI MFG. J-D (Date) / Pat. Nos. 1,329,770 & 1,716,963 | Light Blue | USA | |
| JD | (Under-glaze Ink) MFG. J-D (Date) / Pat. Nos. 1,329,770 & 1,716,963 | Light Blue | USA | |
| JD | (Under-glaze Ink) Numbers / (JD Logo) / MFG. (date) / Pat. Nos. 1,329,770 & 1,716,963 | Light Blue | USA | |
| No Name (J-D) | Brown | USA | ||
| No Name (J-D) | Light Blue | USA | ||
| No Name (J-D) | (Under-glaze Ink) MFG - (Month) - (Year) / (Number) | Brown | USA | |
| No Name (J-D) | (Under-glaze Ink) Pat. Feb 3, 1920 Mfg. (Date) | Brown | USA | |
| No Name (J-D) | (Under-glaze Ink) Pat. Feb 3, 1920 Mfg. (Date) | Light Blue | USA |
ST-6800A
Size: 282mm (11.125")
Example in Photo: J-D (USA)
Photo Credit: Mid Norris
Patent: 1,329,770 - Patented Feb. 3,1920
Patent: 1,716,963 - Patented June 11, 1929
Note: interesting story on the ST-6800A, It is marked JD but was made by Pittsburg high-voltage, and has a Pittsburg date stamp on the top. The story goes that JD had a large order for the standard ST-6800s but could not make them fast enough to fill the orader so had Pittsburgh help!
Example in Photo: J-D (USA)
Photo Credit: Mid Norris
Patent: 1,329,770 - Patented Feb. 3,1920
Patent: 1,716,963 - Patented June 11, 1929
Note: interesting story on the ST-6800A, It is marked JD but was made by Pittsburg high-voltage, and has a Pittsburg date stamp on the top. The story goes that JD had a large order for the standard ST-6800s but could not make them fast enough to fill the orader so had Pittsburgh help!
Direct link to this insulator:
| Manufacturer | Insulator Markings | Cap Markings | Color | Country |
|---|---|---|---|---|
| JD | (Incuse) (Date) | Light Blue | USA | |
| JD | (Incuse) (Date) | J.D.CO./DETROIT // PAT. PDG. | Light Blue | USA |
ST-6805
Size: 279mm (11")
Example in Photo: No Name (J-D) (USA)
Photo Credit: Mid Norris
Patent: 1,329,770 - Patented Feb. 3,1920
Example in Photo: No Name (J-D) (USA)
Photo Credit: Mid Norris
Patent: 1,329,770 - Patented Feb. 3,1920
Direct link to this insulator:
| Manufacturer | Insulator Markings | Cap Markings | Color | Country |
|---|---|---|---|---|
| No Name (J-D) | (Under-glaze Ink) Mfg. Nov. 1930/HI | T | Light Blue | USA |
ST-6825
Size: 285mm (11.25”)
Example in Photo: No Name (J-D) (USA)
Photo Credit: Shaun Kotlarsky
In the collection of: Curtis Erickson
NOTE: Typically we would not assign a number to a disc with out the hardware, The only exception is experimental discs that never had hardware like this example from the J-D Dump.
Example in Photo: No Name (J-D) (USA)
Photo Credit: Shaun Kotlarsky
In the collection of: Curtis Erickson
NOTE: Typically we would not assign a number to a disc with out the hardware, The only exception is experimental discs that never had hardware like this example from the J-D Dump.
Direct link to this insulator:
| Manufacturer | Insulator Markings | Cap Markings | Color | Country |
|---|---|---|---|---|
| No Name (J-D) | Light Blue | USA |