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Telegraph Relay - late 19th Century Object Reg. No: ST 022105

Summary:
Relay of Siemens pattern used at telegraph receiving stations, particularly those operating on long connecting lines. Often signals received over long lines were too weak to operate the receiving instruments directly so the relay served as a very sensitive switch to connect a local battery to the receiving instruments.

Used at Melbourne Observatory.
Description:
Brass baseplate on wooden base carries two horizontal coils. Brass components and screws. Four brass terminals on side and end of wooden base.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 127 mm (Height), 147 mm (Width), 230 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: input/output
Inscriptions: Brass baseplate inscribed:
"386"
User: Melbourne Observatory, South Yarra, Victoria, Australia

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