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Telegraph Pole Changer - circa 1880s Object Reg. No: ST 022107

A relay used in some telegraph systems which reverses the conections of one or more circuits. Used at Melbourne Observatory.
Wooden base supporting a steel or iron 'L' piece and two coils with their axes vertical. 'L' piece supports a horizontal metal plate above the coils. This plate carries spring contacts and four brass screw terminals.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 112 mm (Height), 97 mm (Width), 130 mm (Length)

More information

Tagged with: electrical relays, telegraphy
Themes this item is part of: Telegraphy Collection, Melbourne Observatory Collection, Information & Communication Collection, Positional Astronomy at Melbourne Observatory, Weights & Measures at Melbourne Observatory, Melbourne Observatory & Standard Time in Victoria, Astrographic Catalogue, Transits of Venus, 1874 & 1882, Buildings at Melbourne Observatory, Star Observations & Personal Equation, Meteorology at Melbourne Observatory, 1863-1908, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872
Primary Classification: COMMUNICATIONS
Secondary Classification: Telegraphy
Tertiary Classification: components
User: Melbourne Observatory, South Yarra, Victoria, Australia

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