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Insulators - 'Egg', Radio, circa 1925 Object Reg. No: ST 032858

Summary:
Four insulators used to support aerial wires, known as 'egg' insulators. Australian-made, circa 1925. Two lengths of aerial wire are attached to either end, 'insulated' from each other.

An important feature of the egg insulator is that the arrangement puts the ceramic under compression with a load; ceramic is not very resistant to tension but is under compression.

Used throughout early days of radio reception, for example for crystal set reception in 1920s.
Description:
Each insulator is attached to a small length of aerial wire. Each insulator has an egg shape with grooves and two transverse holes mutually perpendicular to each other at each end.
Discipline: Technology
Dimensions: 38 mm (Length), 27 mm (Diameter)

More information

Tagged with: radio receivers, crystal sets, radios, electronics
Themes this item is part of: Information & Communication Collection
Primary Classification: COMMUNICATIONS
Secondary Classification: Radio
Tertiary Classification: components
Inscriptions: On each egg but very difficult to see because of the glaze and the wire obscuring it: something like "2/1812"
Place & Date Made: Australia, circa 1925

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