Summary
Siemens relay 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.
Physical Description
Brass baseplate on wooden base carries two horizontal coils. Brass components and screws. Four brass terminals, two on each side of wooden base. Fitted with wooden-framed glass cover.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Transfer from Melbourne Observatory, 1945
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Manufacturer
Siemens Bros Dynamo Works Ltd, 1865 or later
Information on Siemens Bros from http://distantwriting.co.uk/appendices.aspx (accessed 27 Feb 2009). -
User
Melbourne Observatory, South Yarra, Greater Melbourne, Victoria, Australia
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Inscriptions
Brass baseplate inscribed: "PATENT SIEMENS BROTHERS LONDON No 1025" Brass baseplate scratched: "109" Marked in white ink on wooden base: "109"
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
212 mm (Length), 152 mm (Width), 138 mm (Height)
Dimensions with glass cover.
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Other Dimensions
212 (Length), 152 (Width), 122 (Height)
Dimensions without glass cover.
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Keywords
