ST-3000-3249

Classic straight caps 152mm (6") and under
ST-3110
ST-3110
ST-3110
Size: 95mm (3.75")
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
No Name (Pittsburg)Redish BrownUSA
ST-3111
ST-3111
ST-3111
Size: 101mm (4")
Example in Photo: No Name (Thomas) (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
No Name (Thomas)GLight BrownUSA
ST-3120
ST-3120
ST-3120
Size: 88mm (3.5")
Example in Photo: VICTOR (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
No Name (Victor)Redish BrownUSA
VictorVICTOR / 607Redish BrownUSA
ST-3240
ST-3240
ST-3240
Size: 152mm (6”)
Example in Photo: Locke (Victor Dump)
Photo Credit: Ken Willick
Notes: Be sure to check out the patent to see how these where used.
Patent: 779, 659 - Patented Jan. 10, 1905
ST-3240
ST-3240
Note: The only surviving example with hardware.
Example in Photo: Locke
Photo Credit: Paul Greaves
Direct link to this insulator:
ManufacturerInsulator MarkingsColorCountry
No Name (Locke)Redish BrownUSA
ST-3245
ST-3245
ST-3245
Size: 152mm (6")
Example in Photo: O-B (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
O-B(O-B Logo) // US PATD/JAN 25 1910/5659 15BrownUSA