electric insulator
Datelate 19th-mid 20th Century
Inventory Number2007-1-0149
ClassificationInsulator
Subject
Maker
American
?
Cultural Region
Dimensions8.1 × 5.9 × 5.9 cm (3 3/16 × 2 5/16 × 2 5/16 in.)
Material
DescriptionPin-type, unibody insulator of brown, glazed ceramic with rounded, tip, two parallel cable grooves along the body and a threaded, smooth base.
Insulators were developed in the 1850s to secure first telegraph, then telephone, and later power lines. They are made from glass, ceramic and later some composition.
Insulators were developed in the 1850s to secure first telegraph, then telephone, and later power lines. They are made from glass, ceramic and later some composition.
Signedunsigned
Curatorial RemarksMade of material similar to 2007-1-0197.
FunctionInsulators like this one are used to suspend bare wires that transmit electricity at very high voltages. They are made of materials that do not conduct electricity even at extreme voltages.
